kvm-s390.c 102.7 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
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 * hosting IBM Z kernel virtual machines (s390x)
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 *
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 * Copyright IBM Corp. 2008, 2017
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 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *               Christian Borntraeger <borntraeger@de.ibm.com>
 *               Heiko Carstens <heiko.carstens@de.ibm.com>
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 *               Christian Ehrhardt <ehrhardt@de.ibm.com>
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 *               Jason J. Herne <jjherne@us.ibm.com>
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 */

#include <linux/compiler.h>
#include <linux/err.h>
#include <linux/fs.h>
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#include <linux/hrtimer.h>
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#include <linux/init.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
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#include <linux/mman.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/timer.h>
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#include <linux/vmalloc.h>
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#include <linux/bitmap.h>
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#include <linux/sched/signal.h>
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#include <linux/string.h>
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#include <asm/asm-offsets.h>
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#include <asm/lowcore.h>
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#include <asm/stp.h>
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#include <asm/pgtable.h>
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#include <asm/gmap.h>
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#include <asm/nmi.h>
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#include <asm/switch_to.h>
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#include <asm/isc.h>
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#include <asm/sclp.h>
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#include <asm/cpacf.h>
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#include <asm/timex.h>
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#include "kvm-s390.h"
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#include "gaccess.h"

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#define KMSG_COMPONENT "kvm-s390"
#undef pr_fmt
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

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#define CREATE_TRACE_POINTS
#include "trace.h"
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#include "trace-s390.h"
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#define MEM_OP_MAX_SIZE 65536	/* Maximum transfer size for KVM_S390_MEM_OP */
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#define LOCAL_IRQS 32
#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
			   (KVM_MAX_VCPUS + LOCAL_IRQS))
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#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU

struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ "userspace_handled", VCPU_STAT(exit_userspace) },
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	{ "exit_null", VCPU_STAT(exit_null) },
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	{ "exit_validity", VCPU_STAT(exit_validity) },
	{ "exit_stop_request", VCPU_STAT(exit_stop_request) },
	{ "exit_external_request", VCPU_STAT(exit_external_request) },
	{ "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
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	{ "exit_instruction", VCPU_STAT(exit_instruction) },
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	{ "exit_pei", VCPU_STAT(exit_pei) },
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	{ "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
	{ "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
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	{ "exit_operation_exception", VCPU_STAT(exit_operation_exception) },
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	{ "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
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	{ "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
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	{ "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
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	{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
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	{ "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
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	{ "instruction_lctl", VCPU_STAT(instruction_lctl) },
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	{ "instruction_stctl", VCPU_STAT(instruction_stctl) },
	{ "instruction_stctg", VCPU_STAT(instruction_stctg) },
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	{ "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
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	{ "deliver_external_call", VCPU_STAT(deliver_external_call) },
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	{ "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
	{ "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
	{ "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
	{ "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
	{ "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
	{ "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
	{ "exit_wait_state", VCPU_STAT(exit_wait_state) },
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	{ "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
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	{ "instruction_stidp", VCPU_STAT(instruction_stidp) },
	{ "instruction_spx", VCPU_STAT(instruction_spx) },
	{ "instruction_stpx", VCPU_STAT(instruction_stpx) },
	{ "instruction_stap", VCPU_STAT(instruction_stap) },
	{ "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
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	{ "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
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	{ "instruction_stsch", VCPU_STAT(instruction_stsch) },
	{ "instruction_chsc", VCPU_STAT(instruction_chsc) },
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	{ "instruction_essa", VCPU_STAT(instruction_essa) },
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	{ "instruction_stsi", VCPU_STAT(instruction_stsi) },
	{ "instruction_stfl", VCPU_STAT(instruction_stfl) },
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	{ "instruction_tprot", VCPU_STAT(instruction_tprot) },
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	{ "instruction_sthyi", VCPU_STAT(instruction_sthyi) },
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	{ "instruction_sie", VCPU_STAT(instruction_sie) },
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	{ "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
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	{ "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
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	{ "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
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	{ "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
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	{ "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
	{ "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
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	{ "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
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	{ "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
	{ "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
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	{ "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) },
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	{ "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
	{ "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
	{ "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
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	{ "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
	{ "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
	{ "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
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	{ "instruction_diag_10", VCPU_STAT(diagnose_10) },
	{ "instruction_diag_44", VCPU_STAT(diagnose_44) },
	{ "instruction_diag_9c", VCPU_STAT(diagnose_9c) },
	{ "instruction_diag_258", VCPU_STAT(diagnose_258) },
	{ "instruction_diag_308", VCPU_STAT(diagnose_308) },
	{ "instruction_diag_500", VCPU_STAT(diagnose_500) },
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	{ NULL }
};

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struct kvm_s390_tod_clock_ext {
	__u8 epoch_idx;
	__u64 tod;
	__u8 reserved[7];
} __packed;

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/* allow nested virtualization in KVM (if enabled by user space) */
static int nested;
module_param(nested, int, S_IRUGO);
MODULE_PARM_DESC(nested, "Nested virtualization support");

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/* upper facilities limit for kvm */
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unsigned long kvm_s390_fac_list_mask[16] = { FACILITIES_KVM };
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unsigned long kvm_s390_fac_list_mask_size(void)
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{
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	BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64);
	return ARRAY_SIZE(kvm_s390_fac_list_mask);
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}

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/* available cpu features supported by kvm */
static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
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/* available subfunctions indicated via query / "test bit" */
static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
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static struct gmap_notifier gmap_notifier;
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static struct gmap_notifier vsie_gmap_notifier;
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debug_info_t *kvm_s390_dbf;
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/* Section: not file related */
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int kvm_arch_hardware_enable(void)
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{
	/* every s390 is virtualization enabled ;-) */
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	return 0;
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}

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static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
			      unsigned long end);
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/*
 * This callback is executed during stop_machine(). All CPUs are therefore
 * temporarily stopped. In order not to change guest behavior, we have to
 * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 * so a CPU won't be stopped while calculating with the epoch.
 */
static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
			  void *v)
{
	struct kvm *kvm;
	struct kvm_vcpu *vcpu;
	int i;
	unsigned long long *delta = v;

	list_for_each_entry(kvm, &vm_list, vm_list) {
		kvm->arch.epoch -= *delta;
		kvm_for_each_vcpu(i, vcpu, kvm) {
			vcpu->arch.sie_block->epoch -= *delta;
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			if (vcpu->arch.cputm_enabled)
				vcpu->arch.cputm_start += *delta;
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			if (vcpu->arch.vsie_block)
				vcpu->arch.vsie_block->epoch -= *delta;
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		}
	}
	return NOTIFY_OK;
}

static struct notifier_block kvm_clock_notifier = {
	.notifier_call = kvm_clock_sync,
};

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int kvm_arch_hardware_setup(void)
{
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	gmap_notifier.notifier_call = kvm_gmap_notifier;
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	gmap_register_pte_notifier(&gmap_notifier);
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	vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
	gmap_register_pte_notifier(&vsie_gmap_notifier);
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	atomic_notifier_chain_register(&s390_epoch_delta_notifier,
				       &kvm_clock_notifier);
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	return 0;
}

void kvm_arch_hardware_unsetup(void)
{
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	gmap_unregister_pte_notifier(&gmap_notifier);
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	gmap_unregister_pte_notifier(&vsie_gmap_notifier);
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	atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
					 &kvm_clock_notifier);
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}

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static void allow_cpu_feat(unsigned long nr)
{
	set_bit_inv(nr, kvm_s390_available_cpu_feat);
}

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static inline int plo_test_bit(unsigned char nr)
{
	register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
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	int cc;
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	asm volatile(
		/* Parameter registers are ignored for "test bit" */
		"	plo	0,0,0,0(0)\n"
		"	ipm	%0\n"
		"	srl	%0,28\n"
		: "=d" (cc)
		: "d" (r0)
		: "cc");
	return cc == 0;
}

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static void kvm_s390_cpu_feat_init(void)
{
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	int i;

	for (i = 0; i < 256; ++i) {
		if (plo_test_bit(i))
			kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
	}

	if (test_facility(28)) /* TOD-clock steering */
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		ptff(kvm_s390_available_subfunc.ptff,
		     sizeof(kvm_s390_available_subfunc.ptff),
		     PTFF_QAF);
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	if (test_facility(17)) { /* MSA */
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		__cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmac);
		__cpacf_query(CPACF_KMC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmc);
		__cpacf_query(CPACF_KM, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.km);
		__cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kimd);
		__cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.klmd);
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	}
	if (test_facility(76)) /* MSA3 */
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		__cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.pckmo);
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	if (test_facility(77)) { /* MSA4 */
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		__cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmctr);
		__cpacf_query(CPACF_KMF, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmf);
		__cpacf_query(CPACF_KMO, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmo);
		__cpacf_query(CPACF_PCC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.pcc);
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	}
	if (test_facility(57)) /* MSA5 */
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		__cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
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			      kvm_s390_available_subfunc.ppno);
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	if (test_facility(146)) /* MSA8 */
		__cpacf_query(CPACF_KMA, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kma);

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	if (MACHINE_HAS_ESOP)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
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	/*
	 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
	 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
	 */
	if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
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	    !test_facility(3) || !nested)
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		return;
	allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
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	if (sclp.has_64bscao)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
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	if (sclp.has_siif)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
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	if (sclp.has_gpere)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
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	if (sclp.has_gsls)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
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	if (sclp.has_ib)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
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	if (sclp.has_cei)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
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	if (sclp.has_ibs)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
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	if (sclp.has_kss)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
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	/*
	 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
	 * all skey handling functions read/set the skey from the PGSTE
	 * instead of the real storage key.
	 *
	 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
	 * pages being detected as preserved although they are resident.
	 *
	 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
	 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
	 *
	 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
	 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
	 * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
	 *
	 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
	 * cannot easily shadow the SCA because of the ipte lock.
	 */
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}

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int kvm_arch_init(void *opaque)
{
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	kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
	if (!kvm_s390_dbf)
		return -ENOMEM;

	if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) {
		debug_unregister(kvm_s390_dbf);
		return -ENOMEM;
	}

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	kvm_s390_cpu_feat_init();

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	/* Register floating interrupt controller interface. */
	return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
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}

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void kvm_arch_exit(void)
{
	debug_unregister(kvm_s390_dbf);
}

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/* Section: device related */
long kvm_arch_dev_ioctl(struct file *filp,
			unsigned int ioctl, unsigned long arg)
{
	if (ioctl == KVM_S390_ENABLE_SIE)
		return s390_enable_sie();
	return -EINVAL;
}

364
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
365
{
366 367
	int r;

368
	switch (ext) {
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	case KVM_CAP_S390_PSW:
370
	case KVM_CAP_S390_GMAP:
371
	case KVM_CAP_SYNC_MMU:
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#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_CAP_S390_UCONTROL:
#endif
375
	case KVM_CAP_ASYNC_PF:
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	case KVM_CAP_SYNC_REGS:
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	case KVM_CAP_ONE_REG:
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	case KVM_CAP_ENABLE_CAP:
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	case KVM_CAP_S390_CSS_SUPPORT:
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Cornelia Huck 已提交
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	case KVM_CAP_IOEVENTFD:
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	case KVM_CAP_DEVICE_CTRL:
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	case KVM_CAP_ENABLE_CAP_VM:
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	case KVM_CAP_S390_IRQCHIP:
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	case KVM_CAP_VM_ATTRIBUTES:
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	case KVM_CAP_MP_STATE:
386
	case KVM_CAP_IMMEDIATE_EXIT:
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	case KVM_CAP_S390_INJECT_IRQ:
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	case KVM_CAP_S390_USER_SIGP:
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	case KVM_CAP_S390_USER_STSI:
390
	case KVM_CAP_S390_SKEYS:
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	case KVM_CAP_S390_IRQ_STATE:
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	case KVM_CAP_S390_USER_INSTR0:
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	case KVM_CAP_S390_CMMA_MIGRATION:
394
	case KVM_CAP_S390_AIS:
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	case KVM_CAP_S390_AIS_MIGRATION:
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		r = 1;
		break;
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	case KVM_CAP_S390_MEM_OP:
		r = MEM_OP_MAX_SIZE;
		break;
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	case KVM_CAP_NR_VCPUS:
	case KVM_CAP_MAX_VCPUS:
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		r = KVM_S390_BSCA_CPU_SLOTS;
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		if (!kvm_s390_use_sca_entries())
			r = KVM_MAX_VCPUS;
		else if (sclp.has_esca && sclp.has_64bscao)
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			r = KVM_S390_ESCA_CPU_SLOTS;
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		break;
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	case KVM_CAP_NR_MEMSLOTS:
		r = KVM_USER_MEM_SLOTS;
		break;
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	case KVM_CAP_S390_COW:
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		r = MACHINE_HAS_ESOP;
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		break;
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	case KVM_CAP_S390_VECTOR_REGISTERS:
		r = MACHINE_HAS_VX;
		break;
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	case KVM_CAP_S390_RI:
		r = test_facility(64);
		break;
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	case KVM_CAP_S390_GS:
		r = test_facility(133);
		break;
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	default:
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		r = 0;
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	}
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	return r;
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}

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static void kvm_s390_sync_dirty_log(struct kvm *kvm,
					struct kvm_memory_slot *memslot)
{
	gfn_t cur_gfn, last_gfn;
	unsigned long address;
	struct gmap *gmap = kvm->arch.gmap;

	/* Loop over all guest pages */
	last_gfn = memslot->base_gfn + memslot->npages;
	for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) {
		address = gfn_to_hva_memslot(memslot, cur_gfn);

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		if (test_and_clear_guest_dirty(gmap->mm, address))
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			mark_page_dirty(kvm, cur_gfn);
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		if (fatal_signal_pending(current))
			return;
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		cond_resched();
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	}
}

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/* Section: vm related */
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static void sca_del_vcpu(struct kvm_vcpu *vcpu);

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/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
			       struct kvm_dirty_log *log)
{
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	int r;
	unsigned long n;
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	struct kvm_memslots *slots;
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	struct kvm_memory_slot *memslot;
	int is_dirty = 0;

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	if (kvm_is_ucontrol(kvm))
		return -EINVAL;

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	mutex_lock(&kvm->slots_lock);

	r = -EINVAL;
	if (log->slot >= KVM_USER_MEM_SLOTS)
		goto out;

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	slots = kvm_memslots(kvm);
	memslot = id_to_memslot(slots, log->slot);
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	r = -ENOENT;
	if (!memslot->dirty_bitmap)
		goto out;

	kvm_s390_sync_dirty_log(kvm, memslot);
	r = kvm_get_dirty_log(kvm, log, &is_dirty);
	if (r)
		goto out;

	/* Clear the dirty log */
	if (is_dirty) {
		n = kvm_dirty_bitmap_bytes(memslot);
		memset(memslot->dirty_bitmap, 0, n);
	}
	r = 0;
out:
	mutex_unlock(&kvm->slots_lock);
	return r;
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}

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static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
{
	unsigned int i;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm) {
		kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
	}
}

506 507 508 509 510 511 512 513
static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
{
	int r;

	if (cap->flags)
		return -EINVAL;

	switch (cap->cap) {
514
	case KVM_CAP_S390_IRQCHIP:
515
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
516 517 518
		kvm->arch.use_irqchip = 1;
		r = 0;
		break;
519
	case KVM_CAP_S390_USER_SIGP:
520
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
521 522 523
		kvm->arch.user_sigp = 1;
		r = 0;
		break;
524
	case KVM_CAP_S390_VECTOR_REGISTERS:
525
		mutex_lock(&kvm->lock);
526
		if (kvm->created_vcpus) {
527 528
			r = -EBUSY;
		} else if (MACHINE_HAS_VX) {
529 530
			set_kvm_facility(kvm->arch.model.fac_mask, 129);
			set_kvm_facility(kvm->arch.model.fac_list, 129);
531 532 533 534
			if (test_facility(134)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 134);
				set_kvm_facility(kvm->arch.model.fac_list, 134);
			}
535 536 537 538
			if (test_facility(135)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 135);
				set_kvm_facility(kvm->arch.model.fac_list, 135);
			}
539 540 541
			r = 0;
		} else
			r = -EINVAL;
542
		mutex_unlock(&kvm->lock);
543 544
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
			 r ? "(not available)" : "(success)");
545
		break;
546 547 548
	case KVM_CAP_S390_RI:
		r = -EINVAL;
		mutex_lock(&kvm->lock);
549
		if (kvm->created_vcpus) {
550 551
			r = -EBUSY;
		} else if (test_facility(64)) {
552 553
			set_kvm_facility(kvm->arch.model.fac_mask, 64);
			set_kvm_facility(kvm->arch.model.fac_list, 64);
554 555 556 557 558 559
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
			 r ? "(not available)" : "(success)");
		break;
560 561 562 563 564 565 566 567 568 569 570 571 572
	case KVM_CAP_S390_AIS:
		mutex_lock(&kvm->lock);
		if (kvm->created_vcpus) {
			r = -EBUSY;
		} else {
			set_kvm_facility(kvm->arch.model.fac_mask, 72);
			set_kvm_facility(kvm->arch.model.fac_list, 72);
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: AIS %s",
			 r ? "(not available)" : "(success)");
		break;
F
Fan Zhang 已提交
573 574 575
	case KVM_CAP_S390_GS:
		r = -EINVAL;
		mutex_lock(&kvm->lock);
576
		if (kvm->created_vcpus) {
F
Fan Zhang 已提交
577 578 579 580 581 582 583 584 585 586
			r = -EBUSY;
		} else if (test_facility(133)) {
			set_kvm_facility(kvm->arch.model.fac_mask, 133);
			set_kvm_facility(kvm->arch.model.fac_list, 133);
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
			 r ? "(not available)" : "(success)");
		break;
587
	case KVM_CAP_S390_USER_STSI:
588
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
589 590 591
		kvm->arch.user_stsi = 1;
		r = 0;
		break;
592 593 594 595 596 597
	case KVM_CAP_S390_USER_INSTR0:
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
		kvm->arch.user_instr0 = 1;
		icpt_operexc_on_all_vcpus(kvm);
		r = 0;
		break;
598 599 600 601 602 603 604
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

605 606 607 608 609 610 611
static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->attr) {
	case KVM_S390_VM_MEM_LIMIT_SIZE:
		ret = 0;
612
		VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
613 614
			 kvm->arch.mem_limit);
		if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
615 616 617 618 619 620 621 622 623 624
			ret = -EFAULT;
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
625 626 627 628 629
{
	int ret;
	unsigned int idx;
	switch (attr->attr) {
	case KVM_S390_VM_MEM_ENABLE_CMMA:
630
		ret = -ENXIO;
631
		if (!sclp.has_cmma)
632 633
			break;

634
		ret = -EBUSY;
635
		VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
636
		mutex_lock(&kvm->lock);
637
		if (!kvm->created_vcpus) {
638 639 640 641 642 643
			kvm->arch.use_cmma = 1;
			ret = 0;
		}
		mutex_unlock(&kvm->lock);
		break;
	case KVM_S390_VM_MEM_CLR_CMMA:
644 645 646
		ret = -ENXIO;
		if (!sclp.has_cmma)
			break;
647 648 649 650
		ret = -EINVAL;
		if (!kvm->arch.use_cmma)
			break;

651
		VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
652 653
		mutex_lock(&kvm->lock);
		idx = srcu_read_lock(&kvm->srcu);
654
		s390_reset_cmma(kvm->arch.gmap->mm);
655 656 657 658
		srcu_read_unlock(&kvm->srcu, idx);
		mutex_unlock(&kvm->lock);
		ret = 0;
		break;
659 660 661 662 663 664 665 666 667
	case KVM_S390_VM_MEM_LIMIT_SIZE: {
		unsigned long new_limit;

		if (kvm_is_ucontrol(kvm))
			return -EINVAL;

		if (get_user(new_limit, (u64 __user *)attr->addr))
			return -EFAULT;

668 669
		if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
		    new_limit > kvm->arch.mem_limit)
670 671
			return -E2BIG;

672 673 674
		if (!new_limit)
			return -EINVAL;

675
		/* gmap_create takes last usable address */
676 677 678
		if (new_limit != KVM_S390_NO_MEM_LIMIT)
			new_limit -= 1;

679 680
		ret = -EBUSY;
		mutex_lock(&kvm->lock);
681
		if (!kvm->created_vcpus) {
682 683
			/* gmap_create will round the limit up */
			struct gmap *new = gmap_create(current->mm, new_limit);
684 685 686 687

			if (!new) {
				ret = -ENOMEM;
			} else {
688
				gmap_remove(kvm->arch.gmap);
689 690 691 692 693 694
				new->private = kvm;
				kvm->arch.gmap = new;
				ret = 0;
			}
		}
		mutex_unlock(&kvm->lock);
695 696 697
		VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
		VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
			 (void *) kvm->arch.gmap->asce);
698 699
		break;
	}
700 701 702 703 704 705 706
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

707 708 709 710 711 712 713
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);

static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_vcpu *vcpu;
	int i;

714
	if (!test_kvm_facility(kvm, 76))
715 716 717 718 719 720 721 722 723
		return -EINVAL;

	mutex_lock(&kvm->lock);
	switch (attr->attr) {
	case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
		get_random_bytes(
			kvm->arch.crypto.crycb->aes_wrapping_key_mask,
			sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
		kvm->arch.crypto.aes_kw = 1;
724
		VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
725 726 727 728 729 730
		break;
	case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
		get_random_bytes(
			kvm->arch.crypto.crycb->dea_wrapping_key_mask,
			sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
		kvm->arch.crypto.dea_kw = 1;
731
		VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
732 733 734 735 736
		break;
	case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
		kvm->arch.crypto.aes_kw = 0;
		memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
			sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
737
		VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
738 739 740 741 742
		break;
	case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
		kvm->arch.crypto.dea_kw = 0;
		memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
			sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
743
		VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
744 745 746 747 748 749 750 751 752 753 754 755 756 757
		break;
	default:
		mutex_unlock(&kvm->lock);
		return -ENXIO;
	}

	kvm_for_each_vcpu(i, vcpu, kvm) {
		kvm_s390_vcpu_crypto_setup(vcpu);
		exit_sie(vcpu);
	}
	mutex_unlock(&kvm->lock);
	return 0;
}

758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
{
	int cx;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(cx, vcpu, kvm)
		kvm_s390_sync_request(req, vcpu);
}

/*
 * Must be called with kvm->srcu held to avoid races on memslots, and with
 * kvm->lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
 */
static int kvm_s390_vm_start_migration(struct kvm *kvm)
{
	struct kvm_s390_migration_state *mgs;
	struct kvm_memory_slot *ms;
	/* should be the only one */
	struct kvm_memslots *slots;
	unsigned long ram_pages;
	int slotnr;

	/* migration mode already enabled */
	if (kvm->arch.migration_state)
		return 0;

	slots = kvm_memslots(kvm);
	if (!slots || !slots->used_slots)
		return -EINVAL;

	mgs = kzalloc(sizeof(*mgs), GFP_KERNEL);
	if (!mgs)
		return -ENOMEM;
	kvm->arch.migration_state = mgs;

	if (kvm->arch.use_cmma) {
		/*
		 * Get the last slot. They should be sorted by base_gfn, so the
		 * last slot is also the one at the end of the address space.
		 * We have verified above that at least one slot is present.
		 */
		ms = slots->memslots + slots->used_slots - 1;
		/* round up so we only use full longs */
		ram_pages = roundup(ms->base_gfn + ms->npages, BITS_PER_LONG);
		/* allocate enough bytes to store all the bits */
		mgs->pgste_bitmap = vmalloc(ram_pages / 8);
		if (!mgs->pgste_bitmap) {
			kfree(mgs);
			kvm->arch.migration_state = NULL;
			return -ENOMEM;
		}

		mgs->bitmap_size = ram_pages;
		atomic64_set(&mgs->dirty_pages, ram_pages);
		/* mark all the pages in active slots as dirty */
		for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
			ms = slots->memslots + slotnr;
			bitmap_set(mgs->pgste_bitmap, ms->base_gfn, ms->npages);
		}

		kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
	}
	return 0;
}

/*
 * Must be called with kvm->lock to avoid races with ourselves and
 * kvm_s390_vm_start_migration.
 */
static int kvm_s390_vm_stop_migration(struct kvm *kvm)
{
	struct kvm_s390_migration_state *mgs;

	/* migration mode already disabled */
	if (!kvm->arch.migration_state)
		return 0;
	mgs = kvm->arch.migration_state;
	kvm->arch.migration_state = NULL;

	if (kvm->arch.use_cmma) {
		kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
		vfree(mgs->pgste_bitmap);
	}
	kfree(mgs);
	return 0;
}

static int kvm_s390_vm_set_migration(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	int idx, res = -ENXIO;

	mutex_lock(&kvm->lock);
	switch (attr->attr) {
	case KVM_S390_VM_MIGRATION_START:
		idx = srcu_read_lock(&kvm->srcu);
		res = kvm_s390_vm_start_migration(kvm);
		srcu_read_unlock(&kvm->srcu, idx);
		break;
	case KVM_S390_VM_MIGRATION_STOP:
		res = kvm_s390_vm_stop_migration(kvm);
		break;
	default:
		break;
	}
	mutex_unlock(&kvm->lock);

	return res;
}

static int kvm_s390_vm_get_migration(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	u64 mig = (kvm->arch.migration_state != NULL);

	if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
		return -ENXIO;

	if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
		return -EFAULT;
	return 0;
}

881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900
static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_tod_clock gtod;

	if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
		return -EFAULT;

	if (test_kvm_facility(kvm, 139))
		kvm_s390_set_tod_clock_ext(kvm, &gtod);
	else if (gtod.epoch_idx == 0)
		kvm_s390_set_tod_clock(kvm, gtod.tod);
	else
		return -EINVAL;

	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
		gtod.epoch_idx, gtod.tod);

	return 0;
}

901 902 903 904 905 906 907 908 909 910
static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
	u8 gtod_high;

	if (copy_from_user(&gtod_high, (void __user *)attr->addr,
					   sizeof(gtod_high)))
		return -EFAULT;

	if (gtod_high != 0)
		return -EINVAL;
911
	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
912 913 914 915 916 917

	return 0;
}

static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
918
	u64 gtod;
919 920 921 922

	if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
		return -EFAULT;

923
	kvm_s390_set_tod_clock(kvm, gtod);
924
	VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod);
925 926 927 928 929 930 931 932 933 934 935
	return 0;
}

static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	if (attr->flags)
		return -EINVAL;

	switch (attr->attr) {
936 937 938
	case KVM_S390_VM_TOD_EXT:
		ret = kvm_s390_set_tod_ext(kvm, attr);
		break;
939 940 941 942 943 944 945 946 947 948 949 950 951
	case KVM_S390_VM_TOD_HIGH:
		ret = kvm_s390_set_tod_high(kvm, attr);
		break;
	case KVM_S390_VM_TOD_LOW:
		ret = kvm_s390_set_tod_low(kvm, attr);
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
static void kvm_s390_get_tod_clock_ext(struct kvm *kvm,
					struct kvm_s390_vm_tod_clock *gtod)
{
	struct kvm_s390_tod_clock_ext htod;

	preempt_disable();

	get_tod_clock_ext((char *)&htod);

	gtod->tod = htod.tod + kvm->arch.epoch;
	gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;

	if (gtod->tod < htod.tod)
		gtod->epoch_idx += 1;

	preempt_enable();
}

static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_tod_clock gtod;

	memset(&gtod, 0, sizeof(gtod));

	if (test_kvm_facility(kvm, 139))
		kvm_s390_get_tod_clock_ext(kvm, &gtod);
	else
		gtod.tod = kvm_s390_get_tod_clock_fast(kvm);

	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
		return -EFAULT;

	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
		gtod.epoch_idx, gtod.tod);
	return 0;
}

989 990 991 992 993 994 995
static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
	u8 gtod_high = 0;

	if (copy_to_user((void __user *)attr->addr, &gtod_high,
					 sizeof(gtod_high)))
		return -EFAULT;
996
	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
997 998 999 1000 1001 1002

	return 0;
}

static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
1003
	u64 gtod;
1004

1005
	gtod = kvm_s390_get_tod_clock_fast(kvm);
1006 1007
	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
		return -EFAULT;
1008
	VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020

	return 0;
}

static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	if (attr->flags)
		return -EINVAL;

	switch (attr->attr) {
1021 1022 1023
	case KVM_S390_VM_TOD_EXT:
		ret = kvm_s390_get_tod_ext(kvm, attr);
		break;
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
	case KVM_S390_VM_TOD_HIGH:
		ret = kvm_s390_get_tod_high(kvm, attr);
		break;
	case KVM_S390_VM_TOD_LOW:
		ret = kvm_s390_get_tod_low(kvm, attr);
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

1037 1038 1039
static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_processor *proc;
1040
	u16 lowest_ibc, unblocked_ibc;
1041 1042 1043
	int ret = 0;

	mutex_lock(&kvm->lock);
1044
	if (kvm->created_vcpus) {
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
		ret = -EBUSY;
		goto out;
	}
	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
	if (!proc) {
		ret = -ENOMEM;
		goto out;
	}
	if (!copy_from_user(proc, (void __user *)attr->addr,
			    sizeof(*proc))) {
1055
		kvm->arch.model.cpuid = proc->cpuid;
1056 1057
		lowest_ibc = sclp.ibc >> 16 & 0xfff;
		unblocked_ibc = sclp.ibc & 0xfff;
1058
		if (lowest_ibc && proc->ibc) {
1059 1060 1061 1062 1063 1064 1065
			if (proc->ibc > unblocked_ibc)
				kvm->arch.model.ibc = unblocked_ibc;
			else if (proc->ibc < lowest_ibc)
				kvm->arch.model.ibc = lowest_ibc;
			else
				kvm->arch.model.ibc = proc->ibc;
		}
1066
		memcpy(kvm->arch.model.fac_list, proc->fac_list,
1067
		       S390_ARCH_FAC_LIST_SIZE_BYTE);
1068 1069 1070 1071 1072 1073 1074
		VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
			 kvm->arch.model.ibc,
			 kvm->arch.model.cpuid);
		VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
			 kvm->arch.model.fac_list[0],
			 kvm->arch.model.fac_list[1],
			 kvm->arch.model.fac_list[2]);
1075 1076 1077 1078 1079 1080 1081 1082
	} else
		ret = -EFAULT;
	kfree(proc);
out:
	mutex_unlock(&kvm->lock);
	return ret;
}

1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
static int kvm_s390_set_processor_feat(struct kvm *kvm,
				       struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;

	if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
		return -EFAULT;
	if (!bitmap_subset((unsigned long *) data.feat,
			   kvm_s390_available_cpu_feat,
			   KVM_S390_VM_CPU_FEAT_NR_BITS))
		return -EINVAL;

	mutex_lock(&kvm->lock);
1096 1097 1098
	if (kvm->created_vcpus) {
		mutex_unlock(&kvm->lock);
		return -EBUSY;
1099
	}
1100 1101
	bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
		    KVM_S390_VM_CPU_FEAT_NR_BITS);
1102
	mutex_unlock(&kvm->lock);
1103 1104 1105 1106 1107
	VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
			 data.feat[0],
			 data.feat[1],
			 data.feat[2]);
	return 0;
1108 1109
}

1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
					  struct kvm_device_attr *attr)
{
	/*
	 * Once supported by kernel + hw, we have to store the subfunctions
	 * in kvm->arch and remember that user space configured them.
	 */
	return -ENXIO;
}

1120 1121 1122 1123 1124 1125 1126 1127
static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->attr) {
	case KVM_S390_VM_CPU_PROCESSOR:
		ret = kvm_s390_set_processor(kvm, attr);
		break;
1128 1129 1130
	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		ret = kvm_s390_set_processor_feat(kvm, attr);
		break;
1131 1132 1133
	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
		ret = kvm_s390_set_processor_subfunc(kvm, attr);
		break;
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
	}
	return ret;
}

static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_processor *proc;
	int ret = 0;

	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
	if (!proc) {
		ret = -ENOMEM;
		goto out;
	}
1148
	proc->cpuid = kvm->arch.model.cpuid;
1149
	proc->ibc = kvm->arch.model.ibc;
1150 1151
	memcpy(&proc->fac_list, kvm->arch.model.fac_list,
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1152 1153 1154 1155 1156 1157 1158
	VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
		 kvm->arch.model.ibc,
		 kvm->arch.model.cpuid);
	VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
		 kvm->arch.model.fac_list[0],
		 kvm->arch.model.fac_list[1],
		 kvm->arch.model.fac_list[2]);
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
	if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
		ret = -EFAULT;
	kfree(proc);
out:
	return ret;
}

static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_machine *mach;
	int ret = 0;

	mach = kzalloc(sizeof(*mach), GFP_KERNEL);
	if (!mach) {
		ret = -ENOMEM;
		goto out;
	}
	get_cpu_id((struct cpuid *) &mach->cpuid);
1177
	mach->ibc = sclp.ibc;
1178
	memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1179
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1180
	memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
1181
	       sizeof(S390_lowcore.stfle_fac_list));
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
		 kvm->arch.model.ibc,
		 kvm->arch.model.cpuid);
	VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
		 mach->fac_mask[0],
		 mach->fac_mask[1],
		 mach->fac_mask[2]);
	VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
		 mach->fac_list[0],
		 mach->fac_list[1],
		 mach->fac_list[2]);
1193 1194 1195 1196 1197 1198 1199
	if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
		ret = -EFAULT;
	kfree(mach);
out:
	return ret;
}

1200 1201 1202 1203 1204 1205 1206 1207 1208
static int kvm_s390_get_processor_feat(struct kvm *kvm,
				       struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;

	bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
		    KVM_S390_VM_CPU_FEAT_NR_BITS);
	if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
		return -EFAULT;
1209 1210 1211 1212
	VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
			 data.feat[0],
			 data.feat[1],
			 data.feat[2]);
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
	return 0;
}

static int kvm_s390_get_machine_feat(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;

	bitmap_copy((unsigned long *) data.feat,
		    kvm_s390_available_cpu_feat,
		    KVM_S390_VM_CPU_FEAT_NR_BITS);
	if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
		return -EFAULT;
1226 1227 1228 1229
	VM_EVENT(kvm, 3, "GET: host feat:  0x%16.16llx.0x%16.16llx.0x%16.16llx",
			 data.feat[0],
			 data.feat[1],
			 data.feat[2]);
1230 1231 1232
	return 0;
}

1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
					  struct kvm_device_attr *attr)
{
	/*
	 * Once we can actually configure subfunctions (kernel + hw support),
	 * we have to check if they were already set by user space, if so copy
	 * them from kvm->arch.
	 */
	return -ENXIO;
}

static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
					struct kvm_device_attr *attr)
{
	if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
	    sizeof(struct kvm_s390_vm_cpu_subfunc)))
		return -EFAULT;
	return 0;
}
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->attr) {
	case KVM_S390_VM_CPU_PROCESSOR:
		ret = kvm_s390_get_processor(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE:
		ret = kvm_s390_get_machine(kvm, attr);
		break;
1263 1264 1265 1266 1267 1268
	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		ret = kvm_s390_get_processor_feat(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE_FEAT:
		ret = kvm_s390_get_machine_feat(kvm, attr);
		break;
1269 1270 1271 1272 1273 1274
	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
		ret = kvm_s390_get_processor_subfunc(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
		ret = kvm_s390_get_machine_subfunc(kvm, attr);
		break;
1275 1276 1277 1278
	}
	return ret;
}

1279 1280 1281 1282 1283
static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
1284
	case KVM_S390_VM_MEM_CTRL:
1285
		ret = kvm_s390_set_mem_control(kvm, attr);
1286
		break;
1287 1288 1289
	case KVM_S390_VM_TOD:
		ret = kvm_s390_set_tod(kvm, attr);
		break;
1290 1291 1292
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_set_cpu_model(kvm, attr);
		break;
1293 1294 1295
	case KVM_S390_VM_CRYPTO:
		ret = kvm_s390_vm_set_crypto(kvm, attr);
		break;
1296 1297 1298
	case KVM_S390_VM_MIGRATION:
		ret = kvm_s390_vm_set_migration(kvm, attr);
		break;
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
1309 1310 1311 1312 1313 1314
	int ret;

	switch (attr->group) {
	case KVM_S390_VM_MEM_CTRL:
		ret = kvm_s390_get_mem_control(kvm, attr);
		break;
1315 1316 1317
	case KVM_S390_VM_TOD:
		ret = kvm_s390_get_tod(kvm, attr);
		break;
1318 1319 1320
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_get_cpu_model(kvm, attr);
		break;
1321 1322 1323
	case KVM_S390_VM_MIGRATION:
		ret = kvm_s390_vm_get_migration(kvm, attr);
		break;
1324 1325 1326 1327 1328 1329
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
1330 1331 1332 1333 1334 1335 1336
}

static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
1337 1338 1339 1340
	case KVM_S390_VM_MEM_CTRL:
		switch (attr->attr) {
		case KVM_S390_VM_MEM_ENABLE_CMMA:
		case KVM_S390_VM_MEM_CLR_CMMA:
1341 1342
			ret = sclp.has_cmma ? 0 : -ENXIO;
			break;
1343
		case KVM_S390_VM_MEM_LIMIT_SIZE:
1344 1345 1346 1347 1348 1349 1350
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
	case KVM_S390_VM_TOD:
		switch (attr->attr) {
		case KVM_S390_VM_TOD_LOW:
		case KVM_S390_VM_TOD_HIGH:
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
1362 1363 1364 1365
	case KVM_S390_VM_CPU_MODEL:
		switch (attr->attr) {
		case KVM_S390_VM_CPU_PROCESSOR:
		case KVM_S390_VM_CPU_MACHINE:
1366 1367
		case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		case KVM_S390_VM_CPU_MACHINE_FEAT:
1368
		case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1369 1370
			ret = 0;
			break;
1371 1372
		/* configuring subfunctions is not supported yet */
		case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1373 1374 1375 1376 1377
		default:
			ret = -ENXIO;
			break;
		}
		break;
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390
	case KVM_S390_VM_CRYPTO:
		switch (attr->attr) {
		case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
		case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
		case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
		case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
1391 1392 1393
	case KVM_S390_VM_MIGRATION:
		ret = 0;
		break;
1394 1395 1396 1397 1398 1399 1400 1401
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

1402 1403 1404 1405
static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
1406
	int srcu_idx, i, r = 0;
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418

	if (args->flags != 0)
		return -EINVAL;

	/* Is this guest using storage keys? */
	if (!mm_use_skey(current->mm))
		return KVM_S390_GET_SKEYS_NONE;

	/* Enforce sane limit on memory allocation */
	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
		return -EINVAL;

1419
	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1420 1421 1422
	if (!keys)
		return -ENOMEM;

1423
	down_read(&current->mm->mmap_sem);
1424
	srcu_idx = srcu_read_lock(&kvm->srcu);
1425 1426 1427 1428
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
1429
			break;
1430 1431
		}

1432 1433
		r = get_guest_storage_key(current->mm, hva, &keys[i]);
		if (r)
1434
			break;
1435
	}
1436
	srcu_read_unlock(&kvm->srcu, srcu_idx);
1437 1438 1439 1440 1441 1442 1443
	up_read(&current->mm->mmap_sem);

	if (!r) {
		r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
				 sizeof(uint8_t) * args->count);
		if (r)
			r = -EFAULT;
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
	}

	kvfree(keys);
	return r;
}

static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
1454
	int srcu_idx, i, r = 0;
1455 1456 1457 1458 1459 1460 1461 1462

	if (args->flags != 0)
		return -EINVAL;

	/* Enforce sane limit on memory allocation */
	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
		return -EINVAL;

1463
	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
	if (!keys)
		return -ENOMEM;

	r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
			   sizeof(uint8_t) * args->count);
	if (r) {
		r = -EFAULT;
		goto out;
	}

	/* Enable storage key handling for the guest */
1475 1476 1477
	r = s390_enable_skey();
	if (r)
		goto out;
1478

1479
	down_read(&current->mm->mmap_sem);
1480
	srcu_idx = srcu_read_lock(&kvm->srcu);
1481 1482 1483 1484
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
1485
			break;
1486 1487 1488 1489 1490
		}

		/* Lowest order bit is reserved */
		if (keys[i] & 0x01) {
			r = -EINVAL;
1491
			break;
1492 1493
		}

1494
		r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1495
		if (r)
1496
			break;
1497
	}
1498
	srcu_read_unlock(&kvm->srcu, srcu_idx);
1499
	up_read(&current->mm->mmap_sem);
1500 1501 1502 1503 1504
out:
	kvfree(keys);
	return r;
}

1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
/*
 * Base address and length must be sent at the start of each block, therefore
 * it's cheaper to send some clean data, as long as it's less than the size of
 * two longs.
 */
#define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
/* for consistency */
#define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)

/*
 * This function searches for the next page with dirty CMMA attributes, and
 * saves the attributes in the buffer up to either the end of the buffer or
 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
 * no trailing clean bytes are saved.
 * In case no dirty bits were found, or if CMMA was not enabled or used, the
 * output buffer will indicate 0 as length.
 */
static int kvm_s390_get_cmma_bits(struct kvm *kvm,
				  struct kvm_s390_cmma_log *args)
{
	struct kvm_s390_migration_state *s = kvm->arch.migration_state;
	unsigned long bufsize, hva, pgstev, i, next, cur;
	int srcu_idx, peek, r = 0, rr;
	u8 *res;

	cur = args->start_gfn;
	i = next = pgstev = 0;

	if (unlikely(!kvm->arch.use_cmma))
		return -ENXIO;
	/* Invalid/unsupported flags were specified */
	if (args->flags & ~KVM_S390_CMMA_PEEK)
		return -EINVAL;
	/* Migration mode query, and we are not doing a migration */
	peek = !!(args->flags & KVM_S390_CMMA_PEEK);
	if (!peek && !s)
		return -EINVAL;
	/* CMMA is disabled or was not used, or the buffer has length zero */
	bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
	if (!bufsize || !kvm->mm->context.use_cmma) {
		memset(args, 0, sizeof(*args));
		return 0;
	}

	if (!peek) {
		/* We are not peeking, and there are no dirty pages */
		if (!atomic64_read(&s->dirty_pages)) {
			memset(args, 0, sizeof(*args));
			return 0;
		}
		cur = find_next_bit(s->pgste_bitmap, s->bitmap_size,
				    args->start_gfn);
		if (cur >= s->bitmap_size)	/* nothing found, loop back */
			cur = find_next_bit(s->pgste_bitmap, s->bitmap_size, 0);
		if (cur >= s->bitmap_size) {	/* again! (very unlikely) */
			memset(args, 0, sizeof(*args));
			return 0;
		}
		next = find_next_bit(s->pgste_bitmap, s->bitmap_size, cur + 1);
	}

	res = vmalloc(bufsize);
	if (!res)
		return -ENOMEM;

	args->start_gfn = cur;

	down_read(&kvm->mm->mmap_sem);
	srcu_idx = srcu_read_lock(&kvm->srcu);
	while (i < bufsize) {
		hva = gfn_to_hva(kvm, cur);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			break;
		}
		/* decrement only if we actually flipped the bit to 0 */
		if (!peek && test_and_clear_bit(cur, s->pgste_bitmap))
			atomic64_dec(&s->dirty_pages);
		r = get_pgste(kvm->mm, hva, &pgstev);
		if (r < 0)
			pgstev = 0;
		/* save the value */
1587
		res[i++] = (pgstev >> 24) & 0x43;
1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
		/*
		 * if the next bit is too far away, stop.
		 * if we reached the previous "next", find the next one
		 */
		if (!peek) {
			if (next > cur + KVM_S390_MAX_BIT_DISTANCE)
				break;
			if (cur == next)
				next = find_next_bit(s->pgste_bitmap,
						     s->bitmap_size, cur + 1);
		/* reached the end of the bitmap or of the buffer, stop */
			if ((next >= s->bitmap_size) ||
			    (next >= args->start_gfn + bufsize))
				break;
		}
		cur++;
	}
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	up_read(&kvm->mm->mmap_sem);
	args->count = i;
	args->remaining = s ? atomic64_read(&s->dirty_pages) : 0;

	rr = copy_to_user((void __user *)args->values, res, args->count);
	if (rr)
		r = -EFAULT;

	vfree(res);
	return r;
}

/*
 * This function sets the CMMA attributes for the given pages. If the input
 * buffer has zero length, no action is taken, otherwise the attributes are
 * set and the mm->context.use_cmma flag is set.
 */
static int kvm_s390_set_cmma_bits(struct kvm *kvm,
				  const struct kvm_s390_cmma_log *args)
{
	unsigned long hva, mask, pgstev, i;
	uint8_t *bits;
	int srcu_idx, r = 0;

	mask = args->mask;

	if (!kvm->arch.use_cmma)
		return -ENXIO;
	/* invalid/unsupported flags */
	if (args->flags != 0)
		return -EINVAL;
	/* Enforce sane limit on memory allocation */
	if (args->count > KVM_S390_CMMA_SIZE_MAX)
		return -EINVAL;
	/* Nothing to do */
	if (args->count == 0)
		return 0;

	bits = vmalloc(sizeof(*bits) * args->count);
	if (!bits)
		return -ENOMEM;

	r = copy_from_user(bits, (void __user *)args->values, args->count);
	if (r) {
		r = -EFAULT;
		goto out;
	}

	down_read(&kvm->mm->mmap_sem);
	srcu_idx = srcu_read_lock(&kvm->srcu);
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			break;
		}

		pgstev = bits[i];
		pgstev = pgstev << 24;
1665
		mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
		set_pgste_bits(kvm->mm, hva, mask, pgstev);
	}
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	up_read(&kvm->mm->mmap_sem);

	if (!kvm->mm->context.use_cmma) {
		down_write(&kvm->mm->mmap_sem);
		kvm->mm->context.use_cmma = 1;
		up_write(&kvm->mm->mmap_sem);
	}
out:
	vfree(bits);
	return r;
}

1681 1682 1683 1684 1685
long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg)
{
	struct kvm *kvm = filp->private_data;
	void __user *argp = (void __user *)arg;
1686
	struct kvm_device_attr attr;
1687 1688 1689
	int r;

	switch (ioctl) {
1690 1691 1692 1693 1694 1695 1696 1697 1698
	case KVM_S390_INTERRUPT: {
		struct kvm_s390_interrupt s390int;

		r = -EFAULT;
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
			break;
		r = kvm_s390_inject_vm(kvm, &s390int);
		break;
	}
1699 1700 1701 1702 1703 1704 1705 1706
	case KVM_ENABLE_CAP: {
		struct kvm_enable_cap cap;
		r = -EFAULT;
		if (copy_from_user(&cap, argp, sizeof(cap)))
			break;
		r = kvm_vm_ioctl_enable_cap(kvm, &cap);
		break;
	}
1707 1708 1709 1710 1711 1712 1713
	case KVM_CREATE_IRQCHIP: {
		struct kvm_irq_routing_entry routing;

		r = -EINVAL;
		if (kvm->arch.use_irqchip) {
			/* Set up dummy routing. */
			memset(&routing, 0, sizeof(routing));
1714
			r = kvm_set_irq_routing(kvm, &routing, 0, 0);
1715 1716 1717
		}
		break;
	}
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
	case KVM_SET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_set_attr(kvm, &attr);
		break;
	}
	case KVM_GET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_get_attr(kvm, &attr);
		break;
	}
	case KVM_HAS_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_has_attr(kvm, &attr);
		break;
	}
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
	case KVM_S390_GET_SKEYS: {
		struct kvm_s390_skeys args;

		r = -EFAULT;
		if (copy_from_user(&args, argp,
				   sizeof(struct kvm_s390_skeys)))
			break;
		r = kvm_s390_get_skeys(kvm, &args);
		break;
	}
	case KVM_S390_SET_SKEYS: {
		struct kvm_s390_skeys args;

		r = -EFAULT;
		if (copy_from_user(&args, argp,
				   sizeof(struct kvm_s390_skeys)))
			break;
		r = kvm_s390_set_skeys(kvm, &args);
		break;
	}
1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
	case KVM_S390_GET_CMMA_BITS: {
		struct kvm_s390_cmma_log args;

		r = -EFAULT;
		if (copy_from_user(&args, argp, sizeof(args)))
			break;
		r = kvm_s390_get_cmma_bits(kvm, &args);
		if (!r) {
			r = copy_to_user(argp, &args, sizeof(args));
			if (r)
				r = -EFAULT;
		}
		break;
	}
	case KVM_S390_SET_CMMA_BITS: {
		struct kvm_s390_cmma_log args;

		r = -EFAULT;
		if (copy_from_user(&args, argp, sizeof(args)))
			break;
		r = kvm_s390_set_cmma_bits(kvm, &args);
		break;
	}
1782
	default:
1783
		r = -ENOTTY;
1784 1785 1786 1787 1788
	}

	return r;
}

1789 1790 1791
static int kvm_s390_query_ap_config(u8 *config)
{
	u32 fcn_code = 0x04000000UL;
1792
	u32 cc = 0;
1793

1794
	memset(config, 0, 128);
1795 1796 1797 1798
	asm volatile(
		"lgr 0,%1\n"
		"lgr 2,%2\n"
		".long 0xb2af0000\n"		/* PQAP(QCI) */
1799
		"0: ipm %0\n"
1800
		"srl %0,28\n"
1801 1802 1803
		"1:\n"
		EX_TABLE(0b, 1b)
		: "+r" (cc)
1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815
		: "r" (fcn_code), "r" (config)
		: "cc", "0", "2", "memory"
	);

	return cc;
}

static int kvm_s390_apxa_installed(void)
{
	u8 config[128];
	int cc;

1816
	if (test_facility(12)) {
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837
		cc = kvm_s390_query_ap_config(config);

		if (cc)
			pr_err("PQAP(QCI) failed with cc=%d", cc);
		else
			return config[0] & 0x40;
	}

	return 0;
}

static void kvm_s390_set_crycb_format(struct kvm *kvm)
{
	kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;

	if (kvm_s390_apxa_installed())
		kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
	else
		kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
}

1838
static u64 kvm_s390_get_initial_cpuid(void)
1839
{
1840 1841 1842 1843 1844
	struct cpuid cpuid;

	get_cpu_id(&cpuid);
	cpuid.version = 0xff;
	return *((u64 *) &cpuid);
1845 1846
}

1847
static void kvm_s390_crypto_init(struct kvm *kvm)
1848
{
1849
	if (!test_kvm_facility(kvm, 76))
1850
		return;
1851

1852
	kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
1853
	kvm_s390_set_crycb_format(kvm);
1854

1855 1856 1857 1858 1859 1860 1861
	/* Enable AES/DEA protected key functions by default */
	kvm->arch.crypto.aes_kw = 1;
	kvm->arch.crypto.dea_kw = 1;
	get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
			 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
	get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
			 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1862 1863
}

1864 1865 1866
static void sca_dispose(struct kvm *kvm)
{
	if (kvm->arch.use_esca)
1867
		free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
1868 1869 1870 1871 1872
	else
		free_page((unsigned long)(kvm->arch.sca));
	kvm->arch.sca = NULL;
}

1873
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
1874
{
1875
	gfp_t alloc_flags = GFP_KERNEL;
1876
	int i, rc;
1877
	char debug_name[16];
1878
	static unsigned long sca_offset;
1879

1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
	rc = -EINVAL;
#ifdef CONFIG_KVM_S390_UCONTROL
	if (type & ~KVM_VM_S390_UCONTROL)
		goto out_err;
	if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
		goto out_err;
#else
	if (type)
		goto out_err;
#endif

1891 1892
	rc = s390_enable_sie();
	if (rc)
1893
		goto out_err;
1894

1895 1896
	rc = -ENOMEM;

1897
	kvm->arch.use_esca = 0; /* start with basic SCA */
1898 1899
	if (!sclp.has_64bscao)
		alloc_flags |= GFP_DMA;
1900
	rwlock_init(&kvm->arch.sca_lock);
1901
	kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
1902
	if (!kvm->arch.sca)
1903
		goto out_err;
1904
	spin_lock(&kvm_lock);
1905
	sca_offset += 16;
1906
	if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
1907
		sca_offset = 0;
1908 1909
	kvm->arch.sca = (struct bsca_block *)
			((char *) kvm->arch.sca + sca_offset);
1910
	spin_unlock(&kvm_lock);
1911 1912 1913

	sprintf(debug_name, "kvm-%u", current->pid);

1914
	kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
1915
	if (!kvm->arch.dbf)
1916
		goto out_err;
1917

1918 1919 1920
	kvm->arch.sie_page2 =
	     (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!kvm->arch.sie_page2)
1921
		goto out_err;
1922

1923
	/* Populate the facility mask initially. */
1924
	memcpy(kvm->arch.model.fac_mask, S390_lowcore.stfle_fac_list,
1925
	       sizeof(S390_lowcore.stfle_fac_list));
1926 1927
	for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
		if (i < kvm_s390_fac_list_mask_size())
1928
			kvm->arch.model.fac_mask[i] &= kvm_s390_fac_list_mask[i];
1929
		else
1930
			kvm->arch.model.fac_mask[i] = 0UL;
1931 1932
	}

1933
	/* Populate the facility list initially. */
1934 1935
	kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
	memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
1936 1937
	       S390_ARCH_FAC_LIST_SIZE_BYTE);

1938 1939 1940 1941
	/* we are always in czam mode - even on pre z14 machines */
	set_kvm_facility(kvm->arch.model.fac_mask, 138);
	set_kvm_facility(kvm->arch.model.fac_list, 138);
	/* we emulate STHYI in kvm */
J
Janosch Frank 已提交
1942 1943
	set_kvm_facility(kvm->arch.model.fac_mask, 74);
	set_kvm_facility(kvm->arch.model.fac_list, 74);
1944 1945 1946 1947
	if (MACHINE_HAS_TLB_GUEST) {
		set_kvm_facility(kvm->arch.model.fac_mask, 147);
		set_kvm_facility(kvm->arch.model.fac_list, 147);
	}
J
Janosch Frank 已提交
1948

1949
	kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
1950
	kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1951

1952
	kvm_s390_crypto_init(kvm);
1953

1954 1955 1956
	mutex_init(&kvm->arch.float_int.ais_lock);
	kvm->arch.float_int.simm = 0;
	kvm->arch.float_int.nimm = 0;
1957
	spin_lock_init(&kvm->arch.float_int.lock);
1958 1959
	for (i = 0; i < FIRQ_LIST_COUNT; i++)
		INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1960
	init_waitqueue_head(&kvm->arch.ipte_wq);
1961
	mutex_init(&kvm->arch.ipte_mutex);
1962

1963
	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1964
	VM_EVENT(kvm, 3, "vm created with type %lu", type);
1965

1966 1967
	if (type & KVM_VM_S390_UCONTROL) {
		kvm->arch.gmap = NULL;
1968
		kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
1969
	} else {
1970
		if (sclp.hamax == U64_MAX)
1971
			kvm->arch.mem_limit = TASK_SIZE_MAX;
1972
		else
1973
			kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
1974
						    sclp.hamax + 1);
1975
		kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
1976
		if (!kvm->arch.gmap)
1977
			goto out_err;
1978
		kvm->arch.gmap->private = kvm;
1979
		kvm->arch.gmap->pfault_enabled = 0;
1980
	}
1981 1982

	kvm->arch.css_support = 0;
1983
	kvm->arch.use_irqchip = 0;
1984
	kvm->arch.epoch = 0;
1985

1986
	spin_lock_init(&kvm->arch.start_stop_lock);
1987
	kvm_s390_vsie_init(kvm);
1988
	KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
1989

1990
	return 0;
1991
out_err:
1992
	free_page((unsigned long)kvm->arch.sie_page2);
1993
	debug_unregister(kvm->arch.dbf);
1994
	sca_dispose(kvm);
1995
	KVM_EVENT(3, "creation of vm failed: %d", rc);
1996
	return rc;
1997 1998
}

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
bool kvm_arch_has_vcpu_debugfs(void)
{
	return false;
}

int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
{
	return 0;
}

2009 2010 2011
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2012
	trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2013
	kvm_s390_clear_local_irqs(vcpu);
2014
	kvm_clear_async_pf_completion_queue(vcpu);
2015
	if (!kvm_is_ucontrol(vcpu->kvm))
2016
		sca_del_vcpu(vcpu);
2017 2018

	if (kvm_is_ucontrol(vcpu->kvm))
2019
		gmap_remove(vcpu->arch.gmap);
2020

2021
	if (vcpu->kvm->arch.use_cmma)
2022
		kvm_s390_vcpu_unsetup_cmma(vcpu);
2023
	free_page((unsigned long)(vcpu->arch.sie_block));
2024

2025
	kvm_vcpu_uninit(vcpu);
2026
	kmem_cache_free(kvm_vcpu_cache, vcpu);
2027 2028 2029 2030 2031
}

static void kvm_free_vcpus(struct kvm *kvm)
{
	unsigned int i;
2032
	struct kvm_vcpu *vcpu;
2033

2034 2035 2036 2037 2038 2039 2040 2041 2042
	kvm_for_each_vcpu(i, vcpu, kvm)
		kvm_arch_vcpu_destroy(vcpu);

	mutex_lock(&kvm->lock);
	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
		kvm->vcpus[i] = NULL;

	atomic_set(&kvm->online_vcpus, 0);
	mutex_unlock(&kvm->lock);
2043 2044
}

2045 2046
void kvm_arch_destroy_vm(struct kvm *kvm)
{
2047
	kvm_free_vcpus(kvm);
2048
	sca_dispose(kvm);
2049
	debug_unregister(kvm->arch.dbf);
2050
	free_page((unsigned long)kvm->arch.sie_page2);
2051
	if (!kvm_is_ucontrol(kvm))
2052
		gmap_remove(kvm->arch.gmap);
2053
	kvm_s390_destroy_adapters(kvm);
2054
	kvm_s390_clear_float_irqs(kvm);
2055
	kvm_s390_vsie_destroy(kvm);
2056 2057 2058 2059
	if (kvm->arch.migration_state) {
		vfree(kvm->arch.migration_state->pgste_bitmap);
		kfree(kvm->arch.migration_state);
	}
2060
	KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2061 2062 2063
}

/* Section: vcpu related */
2064 2065
static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
{
2066
	vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2067 2068 2069 2070 2071 2072 2073
	if (!vcpu->arch.gmap)
		return -ENOMEM;
	vcpu->arch.gmap->private = vcpu->kvm;

	return 0;
}

2074 2075
static void sca_del_vcpu(struct kvm_vcpu *vcpu)
{
2076 2077
	if (!kvm_s390_use_sca_entries())
		return;
2078
	read_lock(&vcpu->kvm->arch.sca_lock);
2079 2080
	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
2081

2082
		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2083
		sca->cpu[vcpu->vcpu_id].sda = 0;
2084 2085 2086 2087
	} else {
		struct bsca_block *sca = vcpu->kvm->arch.sca;

		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2088
		sca->cpu[vcpu->vcpu_id].sda = 0;
2089
	}
2090
	read_unlock(&vcpu->kvm->arch.sca_lock);
2091 2092
}

2093
static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2094
{
2095 2096 2097 2098 2099 2100 2101
	if (!kvm_s390_use_sca_entries()) {
		struct bsca_block *sca = vcpu->kvm->arch.sca;

		/* we still need the basic sca for the ipte control */
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
	}
2102 2103 2104
	read_lock(&vcpu->kvm->arch.sca_lock);
	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
2105

2106
		sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2107 2108
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2109
		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2110
		set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2111
	} else {
2112
		struct bsca_block *sca = vcpu->kvm->arch.sca;
2113

2114
		sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2115 2116
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2117
		set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2118
	}
2119
	read_unlock(&vcpu->kvm->arch.sca_lock);
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
}

/* Basic SCA to Extended SCA data copy routines */
static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
{
	d->sda = s->sda;
	d->sigp_ctrl.c = s->sigp_ctrl.c;
	d->sigp_ctrl.scn = s->sigp_ctrl.scn;
}

static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
{
	int i;

	d->ipte_control = s->ipte_control;
	d->mcn[0] = s->mcn;
	for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
		sca_copy_entry(&d->cpu[i], &s->cpu[i]);
}

static int sca_switch_to_extended(struct kvm *kvm)
{
	struct bsca_block *old_sca = kvm->arch.sca;
	struct esca_block *new_sca;
	struct kvm_vcpu *vcpu;
	unsigned int vcpu_idx;
	u32 scaol, scaoh;

	new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
	if (!new_sca)
		return -ENOMEM;

	scaoh = (u32)((u64)(new_sca) >> 32);
	scaol = (u32)(u64)(new_sca) & ~0x3fU;

	kvm_s390_vcpu_block_all(kvm);
	write_lock(&kvm->arch.sca_lock);

	sca_copy_b_to_e(new_sca, old_sca);

	kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
		vcpu->arch.sie_block->scaoh = scaoh;
		vcpu->arch.sie_block->scaol = scaol;
2163
		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2164 2165 2166 2167 2168 2169 2170 2171 2172
	}
	kvm->arch.sca = new_sca;
	kvm->arch.use_esca = 1;

	write_unlock(&kvm->arch.sca_lock);
	kvm_s390_vcpu_unblock_all(kvm);

	free_page((unsigned long)old_sca);

2173 2174
	VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
		 old_sca, kvm->arch.sca);
2175
	return 0;
2176 2177 2178 2179
}

static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
{
2180 2181
	int rc;

2182 2183 2184 2185 2186
	if (!kvm_s390_use_sca_entries()) {
		if (id < KVM_MAX_VCPUS)
			return true;
		return false;
	}
2187 2188
	if (id < KVM_S390_BSCA_CPU_SLOTS)
		return true;
2189
	if (!sclp.has_esca || !sclp.has_64bscao)
2190 2191 2192 2193 2194 2195 2196
		return false;

	mutex_lock(&kvm->lock);
	rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
	mutex_unlock(&kvm->lock);

	return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2197 2198
}

2199 2200
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
2201 2202
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
2203 2204
	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
				    KVM_SYNC_GPRS |
2205
				    KVM_SYNC_ACRS |
2206 2207 2208
				    KVM_SYNC_CRS |
				    KVM_SYNC_ARCH0 |
				    KVM_SYNC_PFAULT;
2209
	kvm_s390_set_prefix(vcpu, 0);
2210 2211
	if (test_kvm_facility(vcpu->kvm, 64))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
F
Fan Zhang 已提交
2212 2213
	if (test_kvm_facility(vcpu->kvm, 133))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
2214 2215 2216 2217
	/* fprs can be synchronized via vrs, even if the guest has no vx. With
	 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
	 */
	if (MACHINE_HAS_VX)
2218
		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
2219 2220
	else
		vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
2221 2222 2223 2224

	if (kvm_is_ucontrol(vcpu->kvm))
		return __kvm_ucontrol_vcpu_init(vcpu);

2225 2226 2227
	return 0;
}

2228 2229 2230 2231
/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2232
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2233
	vcpu->arch.cputm_start = get_tod_clock_fast();
2234
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2235 2236 2237 2238 2239 2240
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2241
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2242 2243
	vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
	vcpu->arch.cputm_start = 0;
2244
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_enabled);
	vcpu->arch.cputm_enabled = true;
	__start_cpu_timer_accounting(vcpu);
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
	__stop_cpu_timer_accounting(vcpu);
	vcpu->arch.cputm_enabled = false;
}

static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	__enable_cpu_timer_accounting(vcpu);
	preempt_enable();
}

static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	__disable_cpu_timer_accounting(vcpu);
	preempt_enable();
}

2277 2278 2279
/* set the cpu timer - may only be called from the VCPU thread itself */
void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
{
2280
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2281
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2282 2283
	if (vcpu->arch.cputm_enabled)
		vcpu->arch.cputm_start = get_tod_clock_fast();
2284
	vcpu->arch.sie_block->cputm = cputm;
2285
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2286
	preempt_enable();
2287 2288
}

2289
/* update and get the cpu timer - can also be called from other VCPU threads */
2290 2291
__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
{
2292
	unsigned int seq;
2293 2294 2295 2296 2297
	__u64 value;

	if (unlikely(!vcpu->arch.cputm_enabled))
		return vcpu->arch.sie_block->cputm;

2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	do {
		seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
		/*
		 * If the writer would ever execute a read in the critical
		 * section, e.g. in irq context, we have a deadlock.
		 */
		WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
		value = vcpu->arch.sie_block->cputm;
		/* if cputm_start is 0, accounting is being started/stopped */
		if (likely(vcpu->arch.cputm_start))
			value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
	} while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
	preempt_enable();
2312
	return value;
2313 2314
}

2315 2316
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
2317

2318
	gmap_enable(vcpu->arch.enabled_gmap);
2319
	atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2320
	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2321
		__start_cpu_timer_accounting(vcpu);
2322
	vcpu->cpu = cpu;
2323 2324 2325 2326
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
2327
	vcpu->cpu = -1;
2328
	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2329
		__stop_cpu_timer_accounting(vcpu);
2330
	atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2331 2332
	vcpu->arch.enabled_gmap = gmap_get_enabled();
	gmap_disable(vcpu->arch.enabled_gmap);
2333

2334 2335 2336 2337 2338 2339 2340
}

static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
{
	/* this equals initial cpu reset in pop, but we don't switch to ESA */
	vcpu->arch.sie_block->gpsw.mask = 0UL;
	vcpu->arch.sie_block->gpsw.addr = 0UL;
2341
	kvm_s390_set_prefix(vcpu, 0);
2342
	kvm_s390_set_cpu_timer(vcpu, 0);
2343 2344 2345 2346 2347
	vcpu->arch.sie_block->ckc       = 0UL;
	vcpu->arch.sie_block->todpr     = 0;
	memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
	vcpu->arch.sie_block->gcr[0]  = 0xE0UL;
	vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
2348 2349 2350
	/* make sure the new fpc will be lazily loaded */
	save_fpu_regs();
	current->thread.fpu.fpc = 0;
2351
	vcpu->arch.sie_block->gbea = 1;
2352
	vcpu->arch.sie_block->pp = 0;
2353 2354
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
2355 2356
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
		kvm_s390_vcpu_stop(vcpu);
2357
	kvm_s390_clear_local_irqs(vcpu);
2358 2359
}

2360
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2361
{
2362
	mutex_lock(&vcpu->kvm->lock);
2363
	preempt_disable();
2364
	vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2365
	preempt_enable();
2366
	mutex_unlock(&vcpu->kvm->lock);
2367
	if (!kvm_is_ucontrol(vcpu->kvm)) {
2368
		vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2369
		sca_add_vcpu(vcpu);
2370
	}
2371 2372
	if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2373 2374
	/* make vcpu_load load the right gmap on the first trigger */
	vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2375 2376
}

2377 2378
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
{
2379
	if (!test_kvm_facility(vcpu->kvm, 76))
2380 2381
		return;

2382 2383 2384 2385 2386 2387 2388
	vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);

	if (vcpu->kvm->arch.crypto.aes_kw)
		vcpu->arch.sie_block->ecb3 |= ECB3_AES;
	if (vcpu->kvm->arch.crypto.dea_kw)
		vcpu->arch.sie_block->ecb3 |= ECB3_DEA;

2389 2390 2391
	vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
}

2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403
void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
{
	free_page(vcpu->arch.sie_block->cbrlo);
	vcpu->arch.sie_block->cbrlo = 0;
}

int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
{
	vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
	if (!vcpu->arch.sie_block->cbrlo)
		return -ENOMEM;

2404
	vcpu->arch.sie_block->ecb2 &= ~ECB2_PFMFI;
2405 2406 2407
	return 0;
}

2408 2409 2410 2411 2412
static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;

	vcpu->arch.sie_block->ibc = model->ibc;
2413
	if (test_kvm_facility(vcpu->kvm, 7))
2414
		vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2415 2416
}

2417 2418
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
2419
	int rc = 0;
2420

2421 2422
	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
						    CPUSTAT_SM |
2423 2424
						    CPUSTAT_STOPPED);

2425
	if (test_kvm_facility(vcpu->kvm, 78))
2426
		atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
2427
	else if (test_kvm_facility(vcpu->kvm, 8))
2428
		atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
2429

2430 2431
	kvm_s390_vcpu_setup_model(vcpu);

2432 2433
	/* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
	if (MACHINE_HAS_ESOP)
2434
		vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2435
	if (test_kvm_facility(vcpu->kvm, 9))
2436
		vcpu->arch.sie_block->ecb |= ECB_SRSI;
2437
	if (test_kvm_facility(vcpu->kvm, 73))
2438
		vcpu->arch.sie_block->ecb |= ECB_TE;
2439

2440
	if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
2441
		vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2442
	if (test_kvm_facility(vcpu->kvm, 130))
2443 2444
		vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
	vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2445
	if (sclp.has_cei)
2446
		vcpu->arch.sie_block->eca |= ECA_CEI;
2447
	if (sclp.has_ib)
2448
		vcpu->arch.sie_block->eca |= ECA_IB;
2449
	if (sclp.has_siif)
2450
		vcpu->arch.sie_block->eca |= ECA_SII;
2451
	if (sclp.has_sigpif)
2452
		vcpu->arch.sie_block->eca |= ECA_SIGPI;
2453
	if (test_kvm_facility(vcpu->kvm, 129)) {
2454 2455
		vcpu->arch.sie_block->eca |= ECA_VX;
		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
2456
	}
2457 2458 2459
	if (test_kvm_facility(vcpu->kvm, 139))
		vcpu->arch.sie_block->ecd |= ECD_MEF;

F
Fan Zhang 已提交
2460 2461
	vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
					| SDNXC;
2462
	vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
2463 2464 2465 2466 2467

	if (sclp.has_kss)
		atomic_or(CPUSTAT_KSS, &vcpu->arch.sie_block->cpuflags);
	else
		vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
2468

2469
	if (vcpu->kvm->arch.use_cmma) {
2470 2471 2472
		rc = kvm_s390_vcpu_setup_cmma(vcpu);
		if (rc)
			return rc;
2473
	}
2474
	hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2475
	vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
2476

2477 2478
	kvm_s390_vcpu_crypto_setup(vcpu);

2479
	return rc;
2480 2481 2482 2483 2484
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
				      unsigned int id)
{
2485
	struct kvm_vcpu *vcpu;
2486
	struct sie_page *sie_page;
2487 2488
	int rc = -EINVAL;

2489
	if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
2490 2491 2492
		goto out;

	rc = -ENOMEM;
2493

2494
	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2495
	if (!vcpu)
2496
		goto out;
2497

2498
	BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
2499 2500
	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
	if (!sie_page)
2501 2502
		goto out_free_cpu;

2503 2504 2505
	vcpu->arch.sie_block = &sie_page->sie_block;
	vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;

2506 2507 2508 2509
	/* the real guest size will always be smaller than msl */
	vcpu->arch.sie_block->mso = 0;
	vcpu->arch.sie_block->msl = sclp.hamax;

2510
	vcpu->arch.sie_block->icpua = id;
2511
	spin_lock_init(&vcpu->arch.local_int.lock);
2512
	seqcount_init(&vcpu->arch.cputm_seqcount);
2513

2514 2515
	rc = kvm_vcpu_init(vcpu, kvm, id);
	if (rc)
2516
		goto out_free_sie_block;
2517
	VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
2518
		 vcpu->arch.sie_block);
2519
	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
2520 2521

	return vcpu;
2522 2523
out_free_sie_block:
	free_page((unsigned long)(vcpu->arch.sie_block));
2524
out_free_cpu:
2525
	kmem_cache_free(kvm_vcpu_cache, vcpu);
2526
out:
2527 2528 2529 2530 2531
	return ERR_PTR(rc);
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
2532
	return kvm_s390_vcpu_has_irq(vcpu, 0);
2533 2534
}

2535 2536
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
{
2537
	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
2538 2539
}

2540
void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
2541
{
2542
	atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2543
	exit_sie(vcpu);
2544 2545
}

2546
void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
2547
{
2548
	atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2549 2550
}

2551 2552
static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
{
2553
	atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2554
	exit_sie(vcpu);
2555 2556 2557 2558
}

static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
{
2559
	atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2560 2561
}

2562 2563 2564 2565 2566 2567
/*
 * Kick a guest cpu out of SIE and wait until SIE is not running.
 * If the CPU is not running (e.g. waiting as idle) the function will
 * return immediately. */
void exit_sie(struct kvm_vcpu *vcpu)
{
2568
	atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
2569 2570 2571 2572
	while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
		cpu_relax();
}

2573 2574
/* Kick a guest cpu out of SIE to process a request synchronously */
void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
2575
{
2576 2577
	kvm_make_request(req, vcpu);
	kvm_s390_vcpu_request(vcpu);
2578 2579
}

2580 2581
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
			      unsigned long end)
2582 2583 2584
{
	struct kvm *kvm = gmap->private;
	struct kvm_vcpu *vcpu;
2585 2586
	unsigned long prefix;
	int i;
2587

2588 2589
	if (gmap_is_shadow(gmap))
		return;
2590 2591 2592
	if (start >= 1UL << 31)
		/* We are only interested in prefix pages */
		return;
2593 2594
	kvm_for_each_vcpu(i, vcpu, kvm) {
		/* match against both prefix pages */
2595 2596 2597 2598
		prefix = kvm_s390_get_prefix(vcpu);
		if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
			VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
				   start, end);
2599
			kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
2600 2601 2602 2603
		}
	}
}

2604 2605 2606 2607 2608 2609 2610
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

2611 2612 2613 2614 2615 2616
static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;

	switch (reg->id) {
2617 2618 2619 2620 2621 2622 2623 2624
	case KVM_REG_S390_TODPR:
		r = put_user(vcpu->arch.sie_block->todpr,
			     (u32 __user *)reg->addr);
		break;
	case KVM_REG_S390_EPOCHDIFF:
		r = put_user(vcpu->arch.sie_block->epoch,
			     (u64 __user *)reg->addr);
		break;
2625
	case KVM_REG_S390_CPU_TIMER:
2626
		r = put_user(kvm_s390_get_cpu_timer(vcpu),
2627 2628 2629 2630 2631 2632
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = put_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644
	case KVM_REG_S390_PFTOKEN:
		r = put_user(vcpu->arch.pfault_token,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFCOMPARE:
		r = put_user(vcpu->arch.pfault_compare,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFSELECT:
		r = put_user(vcpu->arch.pfault_select,
			     (u64 __user *)reg->addr);
		break;
2645 2646 2647 2648
	case KVM_REG_S390_PP:
		r = put_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
2649 2650 2651 2652
	case KVM_REG_S390_GBEA:
		r = put_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663
	default:
		break;
	}

	return r;
}

static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;
2664
	__u64 val;
2665 2666

	switch (reg->id) {
2667 2668 2669 2670 2671 2672 2673 2674
	case KVM_REG_S390_TODPR:
		r = get_user(vcpu->arch.sie_block->todpr,
			     (u32 __user *)reg->addr);
		break;
	case KVM_REG_S390_EPOCHDIFF:
		r = get_user(vcpu->arch.sie_block->epoch,
			     (u64 __user *)reg->addr);
		break;
2675
	case KVM_REG_S390_CPU_TIMER:
2676 2677 2678
		r = get_user(val, (u64 __user *)reg->addr);
		if (!r)
			kvm_s390_set_cpu_timer(vcpu, val);
2679 2680 2681 2682 2683
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = get_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
2684 2685 2686
	case KVM_REG_S390_PFTOKEN:
		r = get_user(vcpu->arch.pfault_token,
			     (u64 __user *)reg->addr);
2687 2688
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
2689 2690 2691 2692 2693 2694 2695 2696 2697
		break;
	case KVM_REG_S390_PFCOMPARE:
		r = get_user(vcpu->arch.pfault_compare,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFSELECT:
		r = get_user(vcpu->arch.pfault_select,
			     (u64 __user *)reg->addr);
		break;
2698 2699 2700 2701
	case KVM_REG_S390_PP:
		r = get_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
2702 2703 2704 2705
	case KVM_REG_S390_GBEA:
		r = get_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
2706 2707 2708 2709 2710 2711
	default:
		break;
	}

	return r;
}
2712

2713 2714 2715 2716 2717 2718 2719 2720
static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
{
	kvm_s390_vcpu_initial_reset(vcpu);
	return 0;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
2721
	memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
2722 2723 2724 2725 2726
	return 0;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
2727
	memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
2728 2729 2730 2731 2732 2733
	return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
2734
	memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
2735 2736 2737 2738 2739 2740 2741
	memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
	return 0;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
2742
	memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
2743 2744 2745 2746 2747 2748
	memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
	return 0;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
2749 2750
	if (test_fp_ctl(fpu->fpc))
		return -EINVAL;
2751
	vcpu->run->s.regs.fpc = fpu->fpc;
2752
	if (MACHINE_HAS_VX)
2753 2754
		convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
				 (freg_t *) fpu->fprs);
2755
	else
2756
		memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
2757 2758 2759 2760 2761
	return 0;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
2762 2763 2764
	/* make sure we have the latest values */
	save_fpu_regs();
	if (MACHINE_HAS_VX)
2765 2766
		convert_vx_to_fp((freg_t *) fpu->fprs,
				 (__vector128 *) vcpu->run->s.regs.vrs);
2767
	else
2768
		memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
2769
	fpu->fpc = vcpu->run->s.regs.fpc;
2770 2771 2772 2773 2774 2775 2776
	return 0;
}

static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
{
	int rc = 0;

2777
	if (!is_vcpu_stopped(vcpu))
2778
		rc = -EBUSY;
2779 2780 2781 2782
	else {
		vcpu->run->psw_mask = psw.mask;
		vcpu->run->psw_addr = psw.addr;
	}
2783 2784 2785 2786 2787 2788 2789 2790 2791
	return rc;
}

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				  struct kvm_translation *tr)
{
	return -EINVAL; /* not implemented yet */
}

2792 2793 2794 2795
#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
			      KVM_GUESTDBG_USE_HW_BP | \
			      KVM_GUESTDBG_ENABLE)

J
Jan Kiszka 已提交
2796 2797
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
2798
{
2799 2800 2801 2802 2803
	int rc = 0;

	vcpu->guest_debug = 0;
	kvm_s390_clear_bp_data(vcpu);

2804
	if (dbg->control & ~VALID_GUESTDBG_FLAGS)
2805
		return -EINVAL;
2806 2807
	if (!sclp.has_gpere)
		return -EINVAL;
2808 2809 2810 2811

	if (dbg->control & KVM_GUESTDBG_ENABLE) {
		vcpu->guest_debug = dbg->control;
		/* enforce guest PER */
2812
		atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2813 2814 2815 2816

		if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
			rc = kvm_s390_import_bp_data(vcpu, dbg);
	} else {
2817
		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2818 2819 2820 2821 2822 2823
		vcpu->arch.guestdbg.last_bp = 0;
	}

	if (rc) {
		vcpu->guest_debug = 0;
		kvm_s390_clear_bp_data(vcpu);
2824
		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2825 2826 2827
	}

	return rc;
2828 2829
}

2830 2831 2832
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
2833 2834 2835
	/* CHECK_STOP and LOAD are not supported yet */
	return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
				       KVM_MP_STATE_OPERATING;
2836 2837 2838 2839 2840
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860
	int rc = 0;

	/* user space knows about this interface - let it control the state */
	vcpu->kvm->arch.user_cpu_state_ctrl = 1;

	switch (mp_state->mp_state) {
	case KVM_MP_STATE_STOPPED:
		kvm_s390_vcpu_stop(vcpu);
		break;
	case KVM_MP_STATE_OPERATING:
		kvm_s390_vcpu_start(vcpu);
		break;
	case KVM_MP_STATE_LOAD:
	case KVM_MP_STATE_CHECK_STOP:
		/* fall through - CHECK_STOP and LOAD are not supported yet */
	default:
		rc = -ENXIO;
	}

	return rc;
2861 2862
}

2863 2864 2865 2866 2867
static bool ibs_enabled(struct kvm_vcpu *vcpu)
{
	return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
}

2868 2869
static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
{
2870
retry:
2871
	kvm_s390_vcpu_request_handled(vcpu);
R
Radim Krčmář 已提交
2872
	if (!kvm_request_pending(vcpu))
2873
		return 0;
2874 2875
	/*
	 * We use MMU_RELOAD just to re-arm the ipte notifier for the
2876
	 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
2877 2878 2879 2880
	 * This ensures that the ipte instruction for this request has
	 * already finished. We might race against a second unmapper that
	 * wants to set the blocking bit. Lets just retry the request loop.
	 */
2881
	if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
2882
		int rc;
2883 2884 2885
		rc = gmap_mprotect_notify(vcpu->arch.gmap,
					  kvm_s390_get_prefix(vcpu),
					  PAGE_SIZE * 2, PROT_WRITE);
2886 2887
		if (rc) {
			kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
2888
			return rc;
2889
		}
2890
		goto retry;
2891
	}
2892

2893 2894 2895 2896 2897
	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
		vcpu->arch.sie_block->ihcpu = 0xffff;
		goto retry;
	}

2898 2899 2900
	if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
		if (!ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
2901
			atomic_or(CPUSTAT_IBS,
2902 2903 2904
					&vcpu->arch.sie_block->cpuflags);
		}
		goto retry;
2905
	}
2906 2907 2908 2909

	if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
		if (ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
2910
			atomic_andnot(CPUSTAT_IBS,
2911 2912 2913 2914 2915
					  &vcpu->arch.sie_block->cpuflags);
		}
		goto retry;
	}

2916 2917 2918 2919 2920
	if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
		goto retry;
	}

2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941
	if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
		/*
		 * Disable CMMA virtualization; we will emulate the ESSA
		 * instruction manually, in order to provide additional
		 * functionalities needed for live migration.
		 */
		vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
		goto retry;
	}

	if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
		/*
		 * Re-enable CMMA virtualization if CMMA is available and
		 * was used.
		 */
		if ((vcpu->kvm->arch.use_cmma) &&
		    (vcpu->kvm->mm->context.use_cmma))
			vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
		goto retry;
	}

2942
	/* nothing to do, just clear the request */
2943
	kvm_clear_request(KVM_REQ_UNHALT, vcpu);
2944

2945 2946 2947
	return 0;
}

2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976
void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
				 const struct kvm_s390_vm_tod_clock *gtod)
{
	struct kvm_vcpu *vcpu;
	struct kvm_s390_tod_clock_ext htod;
	int i;

	mutex_lock(&kvm->lock);
	preempt_disable();

	get_tod_clock_ext((char *)&htod);

	kvm->arch.epoch = gtod->tod - htod.tod;
	kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;

	if (kvm->arch.epoch > gtod->tod)
		kvm->arch.epdx -= 1;

	kvm_s390_vcpu_block_all(kvm);
	kvm_for_each_vcpu(i, vcpu, kvm) {
		vcpu->arch.sie_block->epoch = kvm->arch.epoch;
		vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
	}

	kvm_s390_vcpu_unblock_all(kvm);
	preempt_enable();
	mutex_unlock(&kvm->lock);
}

2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992
void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
{
	struct kvm_vcpu *vcpu;
	int i;

	mutex_lock(&kvm->lock);
	preempt_disable();
	kvm->arch.epoch = tod - get_tod_clock();
	kvm_s390_vcpu_block_all(kvm);
	kvm_for_each_vcpu(i, vcpu, kvm)
		vcpu->arch.sie_block->epoch = kvm->arch.epoch;
	kvm_s390_vcpu_unblock_all(kvm);
	preempt_enable();
	mutex_unlock(&kvm->lock);
}

2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003
/**
 * kvm_arch_fault_in_page - fault-in guest page if necessary
 * @vcpu: The corresponding virtual cpu
 * @gpa: Guest physical address
 * @writable: Whether the page should be writable or not
 *
 * Make sure that a guest page has been faulted-in on the host.
 *
 * Return: Zero on success, negative error code otherwise.
 */
long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
3004
{
3005 3006
	return gmap_fault(vcpu->arch.gmap, gpa,
			  writable ? FAULT_FLAG_WRITE : 0);
3007 3008
}

3009 3010 3011 3012
static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
				      unsigned long token)
{
	struct kvm_s390_interrupt inti;
3013
	struct kvm_s390_irq irq;
3014 3015

	if (start_token) {
3016 3017 3018
		irq.u.ext.ext_params2 = token;
		irq.type = KVM_S390_INT_PFAULT_INIT;
		WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3019 3020
	} else {
		inti.type = KVM_S390_INT_PFAULT_DONE;
3021
		inti.parm64 = token;
3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067
		WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
	}
}

void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
				     struct kvm_async_pf *work)
{
	trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
	__kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
}

void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
				 struct kvm_async_pf *work)
{
	trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
	__kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
}

void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
			       struct kvm_async_pf *work)
{
	/* s390 will always inject the page directly */
}

bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
{
	/*
	 * s390 will always inject the page directly,
	 * but we still want check_async_completion to cleanup
	 */
	return true;
}

static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
{
	hva_t hva;
	struct kvm_arch_async_pf arch;
	int rc;

	if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
		return 0;
	if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
	    vcpu->arch.pfault_compare)
		return 0;
	if (psw_extint_disabled(vcpu))
		return 0;
3068
	if (kvm_s390_vcpu_has_irq(vcpu, 0))
3069 3070 3071 3072 3073 3074
		return 0;
	if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
		return 0;
	if (!vcpu->arch.gmap->pfault_enabled)
		return 0;

H
Heiko Carstens 已提交
3075 3076 3077
	hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
	hva += current->thread.gmap_addr & ~PAGE_MASK;
	if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
3078 3079 3080 3081 3082 3083
		return 0;

	rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
	return rc;
}

3084
static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3085
{
3086
	int rc, cpuflags;
3087

3088 3089 3090 3091 3092 3093 3094
	/*
	 * On s390 notifications for arriving pages will be delivered directly
	 * to the guest but the house keeping for completed pfaults is
	 * handled outside the worker.
	 */
	kvm_check_async_pf_completion(vcpu);

3095 3096
	vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
	vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3097 3098 3099 3100

	if (need_resched())
		schedule();

3101
	if (test_cpu_flag(CIF_MCCK_PENDING))
3102 3103
		s390_handle_mcck();

3104 3105 3106 3107 3108
	if (!kvm_is_ucontrol(vcpu->kvm)) {
		rc = kvm_s390_deliver_pending_interrupts(vcpu);
		if (rc)
			return rc;
	}
C
Carsten Otte 已提交
3109

3110 3111 3112 3113
	rc = kvm_s390_handle_requests(vcpu);
	if (rc)
		return rc;

3114 3115 3116 3117 3118
	if (guestdbg_enabled(vcpu)) {
		kvm_s390_backup_guest_per_regs(vcpu);
		kvm_s390_patch_guest_per_regs(vcpu);
	}

3119
	vcpu->arch.sie_block->icptcode = 0;
3120 3121 3122
	cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
	VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
	trace_kvm_s390_sie_enter(vcpu, cpuflags);
3123

3124 3125 3126
	return 0;
}

3127 3128
static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
{
3129 3130 3131 3132
	struct kvm_s390_pgm_info pgm_info = {
		.code = PGM_ADDRESSING,
	};
	u8 opcode, ilen;
3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145
	int rc;

	VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
	trace_kvm_s390_sie_fault(vcpu);

	/*
	 * We want to inject an addressing exception, which is defined as a
	 * suppressing or terminating exception. However, since we came here
	 * by a DAT access exception, the PSW still points to the faulting
	 * instruction since DAT exceptions are nullifying. So we've got
	 * to look up the current opcode to get the length of the instruction
	 * to be able to forward the PSW.
	 */
3146
	rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3147
	ilen = insn_length(opcode);
3148 3149 3150 3151 3152 3153 3154 3155 3156 3157
	if (rc < 0) {
		return rc;
	} else if (rc) {
		/* Instruction-Fetching Exceptions - we can't detect the ilen.
		 * Forward by arbitrary ilc, injection will take care of
		 * nullification if necessary.
		 */
		pgm_info = vcpu->arch.pgm;
		ilen = 4;
	}
3158 3159 3160
	pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
	kvm_s390_forward_psw(vcpu, ilen);
	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
3161 3162
}

3163 3164
static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
{
3165 3166 3167
	struct mcck_volatile_info *mcck_info;
	struct sie_page *sie_page;

3168 3169 3170 3171
	VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
		   vcpu->arch.sie_block->icptcode);
	trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);

3172 3173 3174
	if (guestdbg_enabled(vcpu))
		kvm_s390_restore_guest_per_regs(vcpu);

3175 3176
	vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
	vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3177

3178 3179 3180 3181 3182 3183 3184 3185 3186
	if (exit_reason == -EINTR) {
		VCPU_EVENT(vcpu, 3, "%s", "machine check");
		sie_page = container_of(vcpu->arch.sie_block,
					struct sie_page, sie_block);
		mcck_info = &sie_page->mcck_info;
		kvm_s390_reinject_machine_check(vcpu, mcck_info);
		return 0;
	}

3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199
	if (vcpu->arch.sie_block->icptcode > 0) {
		int rc = kvm_handle_sie_intercept(vcpu);

		if (rc != -EOPNOTSUPP)
			return rc;
		vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
		vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
		vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
		vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
		return -EREMOTE;
	} else if (exit_reason != -EFAULT) {
		vcpu->stat.exit_null++;
		return 0;
3200 3201 3202 3203 3204
	} else if (kvm_is_ucontrol(vcpu->kvm)) {
		vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
		vcpu->run->s390_ucontrol.trans_exc_code =
						current->thread.gmap_addr;
		vcpu->run->s390_ucontrol.pgm_code = 0x10;
3205
		return -EREMOTE;
3206
	} else if (current->thread.gmap_pfault) {
3207
		trace_kvm_s390_major_guest_pfault(vcpu);
3208
		current->thread.gmap_pfault = 0;
3209 3210 3211
		if (kvm_arch_setup_async_pf(vcpu))
			return 0;
		return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3212
	}
3213
	return vcpu_post_run_fault_in_sie(vcpu);
3214 3215 3216 3217 3218 3219
}

static int __vcpu_run(struct kvm_vcpu *vcpu)
{
	int rc, exit_reason;

3220 3221 3222 3223 3224 3225
	/*
	 * We try to hold kvm->srcu during most of vcpu_run (except when run-
	 * ning the guest), so that memslots (and other stuff) are protected
	 */
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

3226 3227 3228 3229
	do {
		rc = vcpu_pre_run(vcpu);
		if (rc)
			break;
3230

3231
		srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3232 3233 3234 3235
		/*
		 * As PF_VCPU will be used in fault handler, between
		 * guest_enter and guest_exit should be no uaccess.
		 */
3236
		local_irq_disable();
3237
		guest_enter_irqoff();
3238
		__disable_cpu_timer_accounting(vcpu);
3239
		local_irq_enable();
3240 3241
		exit_reason = sie64a(vcpu->arch.sie_block,
				     vcpu->run->s.regs.gprs);
3242
		local_irq_disable();
3243
		__enable_cpu_timer_accounting(vcpu);
3244
		guest_exit_irqoff();
3245
		local_irq_enable();
3246
		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3247 3248

		rc = vcpu_post_run(vcpu, exit_reason);
3249
	} while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3250

3251
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3252
	return rc;
3253 3254
}

3255 3256
static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
3257
	struct runtime_instr_cb *riccb;
F
Fan Zhang 已提交
3258
	struct gs_cb *gscb;
3259 3260

	riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
F
Fan Zhang 已提交
3261
	gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
3262 3263 3264 3265 3266 3267
	vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
	vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
		memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
3268 3269
		/* some control register changes require a tlb flush */
		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3270 3271
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
3272
		kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
3273 3274 3275 3276 3277 3278 3279 3280 3281
		vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
		vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
		vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
		vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
		vcpu->arch.pfault_token = kvm_run->s.regs.pft;
		vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
		vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
3282 3283
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
3284
	}
F
Fan Zhang 已提交
3285 3286 3287 3288 3289
	/*
	 * If userspace sets the riccb (e.g. after migration) to a valid state,
	 * we should enable RI here instead of doing the lazy enablement.
	 */
	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
3290
	    test_kvm_facility(vcpu->kvm, 64) &&
3291
	    riccb->v &&
3292
	    !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
3293
		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
3294
		vcpu->arch.sie_block->ecb3 |= ECB3_RI;
F
Fan Zhang 已提交
3295
	}
F
Fan Zhang 已提交
3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307
	/*
	 * If userspace sets the gscb (e.g. after migration) to non-zero,
	 * we should enable GS here instead of doing the lazy enablement.
	 */
	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
	    test_kvm_facility(vcpu->kvm, 133) &&
	    gscb->gssm &&
	    !vcpu->arch.gs_enabled) {
		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
		vcpu->arch.sie_block->ecb |= ECB_GS;
		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
		vcpu->arch.gs_enabled = 1;
F
Fan Zhang 已提交
3308
	}
3309 3310
	save_access_regs(vcpu->arch.host_acrs);
	restore_access_regs(vcpu->run->s.regs.acrs);
3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322
	/* save host (userspace) fprs/vrs */
	save_fpu_regs();
	vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
	vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
	if (MACHINE_HAS_VX)
		current->thread.fpu.regs = vcpu->run->s.regs.vrs;
	else
		current->thread.fpu.regs = vcpu->run->s.regs.fprs;
	current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
	if (test_fp_ctl(current->thread.fpu.fpc))
		/* User space provided an invalid FPC, let's clear it */
		current->thread.fpu.fpc = 0;
F
Fan Zhang 已提交
3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336
	if (MACHINE_HAS_GS) {
		preempt_disable();
		__ctl_set_bit(2, 4);
		if (current->thread.gs_cb) {
			vcpu->arch.host_gscb = current->thread.gs_cb;
			save_gs_cb(vcpu->arch.host_gscb);
		}
		if (vcpu->arch.gs_enabled) {
			current->thread.gs_cb = (struct gs_cb *)
						&vcpu->run->s.regs.gscb;
			restore_gs_cb(current->thread.gs_cb);
		}
		preempt_enable();
	}
F
Fan Zhang 已提交
3337

3338 3339 3340 3341 3342 3343 3344 3345 3346
	kvm_run->kvm_dirty_regs = 0;
}

static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
	kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
	kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
	memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
3347
	kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
3348 3349 3350 3351 3352 3353 3354
	kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
	kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
	kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
	kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
	kvm_run->s.regs.pft = vcpu->arch.pfault_token;
	kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
	kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
3355 3356
	save_access_regs(vcpu->run->s.regs.acrs);
	restore_access_regs(vcpu->arch.host_acrs);
3357 3358 3359 3360 3361 3362
	/* Save guest register state */
	save_fpu_regs();
	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
	/* Restore will be done lazily at return */
	current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
	current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
F
Fan Zhang 已提交
3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374
	if (MACHINE_HAS_GS) {
		__ctl_set_bit(2, 4);
		if (vcpu->arch.gs_enabled)
			save_gs_cb(current->thread.gs_cb);
		preempt_disable();
		current->thread.gs_cb = vcpu->arch.host_gscb;
		restore_gs_cb(vcpu->arch.host_gscb);
		preempt_enable();
		if (!vcpu->arch.host_gscb)
			__ctl_clear_bit(2, 4);
		vcpu->arch.host_gscb = NULL;
	}
3375

3376 3377
}

3378 3379
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
3380
	int rc;
3381

3382 3383 3384
	if (kvm_run->immediate_exit)
		return -EINTR;

3385 3386 3387 3388 3389
	if (guestdbg_exit_pending(vcpu)) {
		kvm_s390_prepare_debug_exit(vcpu);
		return 0;
	}

3390
	kvm_sigset_activate(vcpu);
3391

3392 3393 3394
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
		kvm_s390_vcpu_start(vcpu);
	} else if (is_vcpu_stopped(vcpu)) {
3395
		pr_err_ratelimited("can't run stopped vcpu %d\n",
3396 3397 3398
				   vcpu->vcpu_id);
		return -EINVAL;
	}
3399

3400
	sync_regs(vcpu, kvm_run);
3401
	enable_cpu_timer_accounting(vcpu);
3402

3403
	might_fault();
3404
	rc = __vcpu_run(vcpu);
3405

3406 3407
	if (signal_pending(current) && !rc) {
		kvm_run->exit_reason = KVM_EXIT_INTR;
3408
		rc = -EINTR;
3409
	}
3410

3411 3412 3413 3414 3415
	if (guestdbg_exit_pending(vcpu) && !rc)  {
		kvm_s390_prepare_debug_exit(vcpu);
		rc = 0;
	}

3416
	if (rc == -EREMOTE) {
3417
		/* userspace support is needed, kvm_run has been prepared */
3418 3419
		rc = 0;
	}
3420

3421
	disable_cpu_timer_accounting(vcpu);
3422
	store_regs(vcpu, kvm_run);
3423

3424
	kvm_sigset_deactivate(vcpu);
3425 3426

	vcpu->stat.exit_userspace++;
3427
	return rc;
3428 3429 3430 3431 3432 3433 3434 3435
}

/*
 * store status at address
 * we use have two special cases:
 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
 */
3436
int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
3437
{
3438
	unsigned char archmode = 1;
3439
	freg_t fprs[NUM_FPRS];
3440
	unsigned int px;
3441
	u64 clkcomp, cputm;
3442
	int rc;
3443

3444
	px = kvm_s390_get_prefix(vcpu);
3445 3446
	if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
		if (write_guest_abs(vcpu, 163, &archmode, 1))
3447
			return -EFAULT;
3448
		gpa = 0;
3449 3450
	} else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
		if (write_guest_real(vcpu, 163, &archmode, 1))
3451
			return -EFAULT;
3452 3453 3454
		gpa = px;
	} else
		gpa -= __LC_FPREGS_SAVE_AREA;
3455 3456 3457

	/* manually convert vector registers if necessary */
	if (MACHINE_HAS_VX) {
3458
		convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
3459 3460 3461 3462
		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
				     fprs, 128);
	} else {
		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3463
				     vcpu->run->s.regs.fprs, 128);
3464
	}
3465
	rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
3466
			      vcpu->run->s.regs.gprs, 128);
3467
	rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
3468
			      &vcpu->arch.sie_block->gpsw, 16);
3469
	rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
3470
			      &px, 4);
3471
	rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
3472
			      &vcpu->run->s.regs.fpc, 4);
3473
	rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
3474
			      &vcpu->arch.sie_block->todpr, 4);
3475
	cputm = kvm_s390_get_cpu_timer(vcpu);
3476
	rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
3477
			      &cputm, 8);
3478
	clkcomp = vcpu->arch.sie_block->ckc >> 8;
3479
	rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
3480
			      &clkcomp, 8);
3481
	rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
3482
			      &vcpu->run->s.regs.acrs, 64);
3483
	rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
3484 3485
			      &vcpu->arch.sie_block->gcr, 128);
	return rc ? -EFAULT : 0;
3486 3487
}

3488 3489 3490 3491
int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
{
	/*
	 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
3492
	 * switch in the run ioctl. Let's update our copies before we save
3493 3494
	 * it into the save area
	 */
3495
	save_fpu_regs();
3496
	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3497 3498 3499 3500 3501
	save_access_regs(vcpu->run->s.regs.acrs);

	return kvm_s390_store_status_unloaded(vcpu, addr);
}

3502 3503 3504
static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
	kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
3505
	kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519
}

static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
{
	unsigned int i;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm) {
		__disable_ibs_on_vcpu(vcpu);
	}
}

static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
3520 3521
	if (!sclp.has_ibs)
		return;
3522
	kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
3523
	kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
3524 3525
}

3526 3527
void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
{
3528 3529 3530 3531 3532
	int i, online_vcpus, started_vcpus = 0;

	if (!is_vcpu_stopped(vcpu))
		return;

3533
	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
3534
	/* Only one cpu at a time may enter/leave the STOPPED state. */
3535
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554
	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);

	for (i = 0; i < online_vcpus; i++) {
		if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
			started_vcpus++;
	}

	if (started_vcpus == 0) {
		/* we're the only active VCPU -> speed it up */
		__enable_ibs_on_vcpu(vcpu);
	} else if (started_vcpus == 1) {
		/*
		 * As we are starting a second VCPU, we have to disable
		 * the IBS facility on all VCPUs to remove potentially
		 * oustanding ENABLE requests.
		 */
		__disable_ibs_on_all_vcpus(vcpu->kvm);
	}

3555
	atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3556 3557 3558 3559
	/*
	 * Another VCPU might have used IBS while we were offline.
	 * Let's play safe and flush the VCPU at startup.
	 */
3560
	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3561
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3562
	return;
3563 3564 3565 3566
}

void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
{
3567 3568 3569 3570 3571 3572
	int i, online_vcpus, started_vcpus = 0;
	struct kvm_vcpu *started_vcpu = NULL;

	if (is_vcpu_stopped(vcpu))
		return;

3573
	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
3574
	/* Only one cpu at a time may enter/leave the STOPPED state. */
3575
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
3576 3577
	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);

3578
	/* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
3579
	kvm_s390_clear_stop_irq(vcpu);
3580

3581
	atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598
	__disable_ibs_on_vcpu(vcpu);

	for (i = 0; i < online_vcpus; i++) {
		if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
			started_vcpus++;
			started_vcpu = vcpu->kvm->vcpus[i];
		}
	}

	if (started_vcpus == 1) {
		/*
		 * As we only have one VCPU left, we want to enable the
		 * IBS facility for that VCPU to speed it up.
		 */
		__enable_ibs_on_vcpu(started_vcpu);
	}

3599
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3600
	return;
3601 3602
}

3603 3604 3605 3606 3607 3608 3609 3610 3611
static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
				     struct kvm_enable_cap *cap)
{
	int r;

	if (cap->flags)
		return -EINVAL;

	switch (cap->cap) {
3612 3613 3614
	case KVM_CAP_S390_CSS_SUPPORT:
		if (!vcpu->kvm->arch.css_support) {
			vcpu->kvm->arch.css_support = 1;
3615
			VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
3616 3617 3618 3619
			trace_kvm_s390_enable_css(vcpu->kvm);
		}
		r = 0;
		break;
3620 3621 3622 3623 3624 3625 3626
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652
static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
				  struct kvm_s390_mem_op *mop)
{
	void __user *uaddr = (void __user *)mop->buf;
	void *tmpbuf = NULL;
	int r, srcu_idx;
	const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
				    | KVM_S390_MEMOP_F_CHECK_ONLY;

	if (mop->flags & ~supported_flags)
		return -EINVAL;

	if (mop->size > MEM_OP_MAX_SIZE)
		return -E2BIG;

	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
		tmpbuf = vmalloc(mop->size);
		if (!tmpbuf)
			return -ENOMEM;
	}

	srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

	switch (mop->op) {
	case KVM_S390_MEMOP_LOGICAL_READ:
		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3653 3654
			r = check_gva_range(vcpu, mop->gaddr, mop->ar,
					    mop->size, GACC_FETCH);
3655 3656 3657 3658 3659 3660 3661 3662 3663 3664
			break;
		}
		r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
		if (r == 0) {
			if (copy_to_user(uaddr, tmpbuf, mop->size))
				r = -EFAULT;
		}
		break;
	case KVM_S390_MEMOP_LOGICAL_WRITE:
		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3665 3666
			r = check_gva_range(vcpu, mop->gaddr, mop->ar,
					    mop->size, GACC_STORE);
3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687
			break;
		}
		if (copy_from_user(tmpbuf, uaddr, mop->size)) {
			r = -EFAULT;
			break;
		}
		r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
		break;
	default:
		r = -EINVAL;
	}

	srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);

	if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
		kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);

	vfree(tmpbuf);
	return r;
}

3688 3689 3690 3691 3692
long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg)
{
	struct kvm_vcpu *vcpu = filp->private_data;
	void __user *argp = (void __user *)arg;
3693
	int idx;
3694
	long r;
3695

3696
	switch (ioctl) {
3697 3698 3699 3700 3701 3702 3703 3704 3705
	case KVM_S390_IRQ: {
		struct kvm_s390_irq s390irq;

		r = -EFAULT;
		if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
			break;
		r = kvm_s390_inject_vcpu(vcpu, &s390irq);
		break;
	}
3706
	case KVM_S390_INTERRUPT: {
3707
		struct kvm_s390_interrupt s390int;
3708
		struct kvm_s390_irq s390irq;
3709

3710
		r = -EFAULT;
3711
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
3712
			break;
3713 3714 3715
		if (s390int_to_s390irq(&s390int, &s390irq))
			return -EINVAL;
		r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3716
		break;
3717
	}
3718
	case KVM_S390_STORE_STATUS:
3719
		idx = srcu_read_lock(&vcpu->kvm->srcu);
3720
		r = kvm_s390_vcpu_store_status(vcpu, arg);
3721
		srcu_read_unlock(&vcpu->kvm->srcu, idx);
3722
		break;
3723 3724 3725
	case KVM_S390_SET_INITIAL_PSW: {
		psw_t psw;

3726
		r = -EFAULT;
3727
		if (copy_from_user(&psw, argp, sizeof(psw)))
3728 3729 3730
			break;
		r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
		break;
3731 3732
	}
	case KVM_S390_INITIAL_RESET:
3733 3734
		r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
		break;
3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746
	case KVM_SET_ONE_REG:
	case KVM_GET_ONE_REG: {
		struct kvm_one_reg reg;
		r = -EFAULT;
		if (copy_from_user(&reg, argp, sizeof(reg)))
			break;
		if (ioctl == KVM_SET_ONE_REG)
			r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
		else
			r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
		break;
	}
3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782
#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_S390_UCAS_MAP: {
		struct kvm_s390_ucas_mapping ucasmap;

		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
			r = -EFAULT;
			break;
		}

		if (!kvm_is_ucontrol(vcpu->kvm)) {
			r = -EINVAL;
			break;
		}

		r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
				     ucasmap.vcpu_addr, ucasmap.length);
		break;
	}
	case KVM_S390_UCAS_UNMAP: {
		struct kvm_s390_ucas_mapping ucasmap;

		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
			r = -EFAULT;
			break;
		}

		if (!kvm_is_ucontrol(vcpu->kvm)) {
			r = -EINVAL;
			break;
		}

		r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
			ucasmap.length);
		break;
	}
#endif
3783
	case KVM_S390_VCPU_FAULT: {
3784
		r = gmap_fault(vcpu->arch.gmap, arg, 0);
3785 3786
		break;
	}
3787 3788 3789 3790 3791 3792 3793 3794 3795
	case KVM_ENABLE_CAP:
	{
		struct kvm_enable_cap cap;
		r = -EFAULT;
		if (copy_from_user(&cap, argp, sizeof(cap)))
			break;
		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
		break;
	}
3796 3797 3798 3799 3800 3801 3802 3803 3804
	case KVM_S390_MEM_OP: {
		struct kvm_s390_mem_op mem_op;

		if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
			r = kvm_s390_guest_mem_op(vcpu, &mem_op);
		else
			r = -EFAULT;
		break;
	}
3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816
	case KVM_S390_SET_IRQ_STATE: {
		struct kvm_s390_irq_state irq_state;

		r = -EFAULT;
		if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
			break;
		if (irq_state.len > VCPU_IRQS_MAX_BUF ||
		    irq_state.len == 0 ||
		    irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
			r = -EINVAL;
			break;
		}
3817
		/* do not use irq_state.flags, it will break old QEMUs */
3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832
		r = kvm_s390_set_irq_state(vcpu,
					   (void __user *) irq_state.buf,
					   irq_state.len);
		break;
	}
	case KVM_S390_GET_IRQ_STATE: {
		struct kvm_s390_irq_state irq_state;

		r = -EFAULT;
		if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
			break;
		if (irq_state.len == 0) {
			r = -EINVAL;
			break;
		}
3833
		/* do not use irq_state.flags, it will break old QEMUs */
3834 3835 3836 3837 3838
		r = kvm_s390_get_irq_state(vcpu,
					   (__u8 __user *)  irq_state.buf,
					   irq_state.len);
		break;
	}
3839
	default:
3840
		r = -ENOTTY;
3841
	}
3842
	return r;
3843 3844
}

3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
#ifdef CONFIG_KVM_S390_UCONTROL
	if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
		 && (kvm_is_ucontrol(vcpu->kvm))) {
		vmf->page = virt_to_page(vcpu->arch.sie_block);
		get_page(vmf->page);
		return 0;
	}
#endif
	return VM_FAULT_SIGBUS;
}

3858 3859
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
			    unsigned long npages)
3860 3861 3862 3863
{
	return 0;
}

3864
/* Section: memory related */
3865 3866
int kvm_arch_prepare_memory_region(struct kvm *kvm,
				   struct kvm_memory_slot *memslot,
3867
				   const struct kvm_userspace_memory_region *mem,
3868
				   enum kvm_mr_change change)
3869
{
3870 3871 3872 3873
	/* A few sanity checks. We can have memory slots which have to be
	   located/ended at a segment boundary (1MB). The memory in userland is
	   ok to be fragmented into various different vmas. It is okay to mmap()
	   and munmap() stuff in this slot after doing this call at any time */
3874

3875
	if (mem->userspace_addr & 0xffffful)
3876 3877
		return -EINVAL;

3878
	if (mem->memory_size & 0xffffful)
3879 3880
		return -EINVAL;

3881 3882 3883
	if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
		return -EINVAL;

3884 3885 3886 3887
	return 0;
}

void kvm_arch_commit_memory_region(struct kvm *kvm,
3888
				const struct kvm_userspace_memory_region *mem,
3889
				const struct kvm_memory_slot *old,
3890
				const struct kvm_memory_slot *new,
3891
				enum kvm_mr_change change)
3892
{
3893
	int rc;
3894

3895 3896 3897 3898 3899 3900 3901 3902 3903 3904
	/* If the basics of the memslot do not change, we do not want
	 * to update the gmap. Every update causes several unnecessary
	 * segment translation exceptions. This is usually handled just
	 * fine by the normal fault handler + gmap, but it will also
	 * cause faults on the prefix page of running guest CPUs.
	 */
	if (old->userspace_addr == mem->userspace_addr &&
	    old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
	    old->npages * PAGE_SIZE == mem->memory_size)
		return;
3905 3906 3907 3908

	rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
		mem->guest_phys_addr, mem->memory_size);
	if (rc)
3909
		pr_warn("failed to commit memory region\n");
3910
	return;
3911 3912
}

3913 3914 3915 3916 3917 3918 3919
static inline unsigned long nonhyp_mask(int i)
{
	unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;

	return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
}

3920 3921 3922 3923 3924
void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
{
	vcpu->valid_wakeup = false;
}

3925 3926
static int __init kvm_s390_init(void)
{
3927 3928
	int i;

3929 3930 3931 3932 3933
	if (!sclp.has_sief2) {
		pr_info("SIE not available\n");
		return -ENODEV;
	}

3934 3935 3936 3937
	for (i = 0; i < 16; i++)
		kvm_s390_fac_list_mask[i] |=
			S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);

3938
	return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
3939 3940 3941 3942 3943 3944 3945 3946 3947
}

static void __exit kvm_s390_exit(void)
{
	kvm_exit();
}

module_init(kvm_s390_init);
module_exit(kvm_s390_exit);
3948 3949 3950 3951 3952 3953 3954 3955 3956

/*
 * Enable autoloading of the kvm module.
 * Note that we add the module alias here instead of virt/kvm/kvm_main.c
 * since x86 takes a different approach.
 */
#include <linux/miscdevice.h>
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");